小菜鸟之Oracle数据库

  1 select * from STUDENT;
  2 select * from mark;
  3 select * from COURSE;
  4 
  5 select * from teacher;
  6 
  7 --注释
  8 select sname from student;--投影查询
  9 select * from student;
 10 select sname as 姓名,ssex as 性别,sage from student ;--属性起别名
 11 select sname 姓名,ssex 性别,sage from student ;
 12 select distinct sage,ssex  from student;--distinct 修饰组合，去掉重复的
 13 select    5
 14 from      1
 15 where     2
 16 group by  3
 17 having    4
 18 order by  6
 19  select * from student
 20 where SNATIVEPLACE='上海'
 21 select * from student where sage=19;--查询十九岁
 22 = >  <=  >= ！=  and or not   not > and >or
 23 select * from student
 24 where(sage=19 or sage =21)and ssex ='男';
 25 
 26 select * from student where SNATIVEPLACE !='福建' and
 27 select * from student where  not  sage=19 or ssex='女' and SNATIVEPLACE ='福建'--除福建
 28 select * from student where (SNATIVEPLACE='福建'and ssex='女') or ( not SNATIVEPLACE='上海'and ssex='男')
 29 --来自福建的女生以及上海以外的男生
 30 select * from STUDENT
 31 where SAGE between 19 and 20---20  dao 19
 32 select * from STUDENT
 33 where sage in(19,20,22) and ssex='男'--in集合数  19 20 22 男生
 34 select * from STUDENT where sname like '王%'
 35 --模糊查找 like '%' 下划线表示几个名__  %任意几个名
 36 select * from STUDENT where sname like '徐__'
 37 insert into STUDENT(sid,SNAME) values(10039,'小雅')
 38 select  * from STUDENT where SSEX is null  --数据为空 is null
 39 select  ssex,min(SAGE),max(SAGE),avg(SAGE),sum(SAGE),count(*) from STUDENT group by SSEX
 40 select SNATIVEPLACE,count(*) from STUDENT where SSEX='男' group by SNATIVEPLACE; 统计各个地区男生数
 41 select * from MARK
 42 select sid,avg(cmark) from mark group by sid;--每个学生均分
 43 select sid,min(cmark),count(*) from mark  where CMARK<60 group by sid--不及格数目（查询条件出现个，每个就是分组
 44 select SCLASS,count(distinct SNATIVEPLACE) from STUDENT group by SCLASS--各个学生分别来自多少不同的地区
 45 select *from STUDENT
 46 
 47 select ssex,sage, count(*)   from student group by ssex,sage  --可以同时性别，年龄进行分组
 48 select  max(SAGE) from STUDENT
 49 select sid from mark group by sid having avg(cmark)>80
 50 select SID from MARK where CMARK>80 group by SID--where中不能出现avg 之类的 where avg（mark）》80
 51 select SNATIVEPLACE,count(*)from STUDENT where SSEX='男' group by SNATIVEPLACE---各个地区的男生人数
 52 select SNATIVEPLACE,count(*) from STUDENT group by SNATIVEPLACE,SSEX having SSEX='男'---各个地区的男生人数
 53 select * from STUDENT order by SAGE desc--asc升序，desc降序（空属性第一大 根据年龄排序
 54 select * from STUDENT order by SAGE desc,sid --二阶排序在年龄相同的情况下sid排序
 55 select * from STUDENT order by SAGE asc
 56 select sid,avg(cmark) amk from MARK group by SID order by amk desc--j降序均分
 57 select trunc(CMARK/10)*10||'`'||(trunc(CMARK/10)*10+9),count(*)  from MARK where CID=2001--(学科
 58 group by trunc(CMARK/10)
 59 
 60 --分段，turnc取证
 61 select  * from STUDENT,MARK where STUDENT.sid=mark.sid--俩个表合一
 62 select  * from STUDENT s,MARK m where s.SID=m.SID
 63 select  * from STUDENT,MARK,COURSE
 64 where STUDENT.sid=mark.sid and mark.cid=COURSE.cid;
 65 
 66 select SNATIVEPLACE,avg(cmark)  from STUDENT,mark,COURSE where STUDENT.sid=mark.sid and mark.cid=COURSE.cid and CNAME='数学'
 67 group by SNATIVEPLACE---各个地区数学均分
 68 select sname,avg(CMARK) from STUDENT s,MARK m where s.sid=m.sid and SSEX='男' group by s.sid,SNAME--找出每个男生平均分，显示其姓名，均分
 69 select * from STU,DENT s,MARK m where s.sid=m.sid and SSEX='男'
 70 select * from MARK a,MARK b where a.sid=10002 and b.sid=10003 and a.cid=b.cid  and a.cmark>b.cmark
 71 select SNAME from MARK a,MARK b,STUDENT s  where a.sid=b.sid and a.cid=2001  and b.cid=2002  and a.cmark>b.cmark
 72 --那些同学20001号课程成绩比自己的20002成绩高，找sid
 73 --查询核心1.from：将表格从硬盘的文件进行提取，并形成实例 将内存的实例从上往下依次循环，每次提取一条记录，并交给后续的子句 在多表中会对多张表进行笛卡尔想成，生成巨大的笛卡尔乘积
 74 -- 2.每个字句在执行顺序
 75 --where 接受from 给自己的一一条记录，对记录进行合法判断 =  >=  <= != <>,这些是比大小 而且可以比字符串，而且比大小的过程中，式子两边必须一个是属性，一个是值 支持逻辑 and or not   not》and
 76 》or 支持between连续空间 如果空间不连续 有in（） 模糊查询like %表示多个任意字母而__表示一个任意字母
 77 -- 空的匹配使用 is null 或者is not null 不可以使用匹配null
 78  -- group by sage 含义是将整个表根据sage 进行分组，分组：sage值相同的记录合并至一个“小组”中
 79  解释器不会遍历记录，而是遍历小组
 80  因此select 语句可以查询的特征语句必须来自group by 的分组特征
 81 --group by 之后可以跟随多个属性进行分组特征，先后顺序不重要
 82 ---可以没有group by 语句直接进行查询统计结果 这类语句默认分组，就是将整个结果当成一个组看待
 83 select 语句的作用投影的信息至屏幕上，属性之间分隔符号为英文逗号，属性可以起别名，as 最好省，*是通配符，表示这张表所有的属性select
 84 可以去重，distinct
 85 order by 的作用排序，须指定属性
 86 desc 降序
 87 asc 升序
 88 order by 表示一阶属性相同时，使用二节顺序的值
 89 
 90 select  sname  from MARK a,MARK b,STUDENT s
 91 where a.cid!=b.cid and   a.sid==10002 and a.sid=b.sid a.sname='数学' and b.sname='英语'
 92 and a.cmark>b.cmark
 93 那些学生2001号成绩大于2002号成绩
 94 --1、与“张三”同乡的男生姓名
 95 select * from STUDENT where SNAME='张三'
 96 select SNAME from STUDENT where  SNATIVEPLACE='江苏'and SSEX='男'
 97 select  * from STUDENT a,STUDENT b    where a.SNATIVEPLACE=b.SNATIVEPLACE;
 98 select a.*from STUDENT a,STUDENT b
 99 where a.SNATIVEPLACE=b.SNATIVEPLACE and b.SNAME='张三' and a.SSEX='男' and a.SNAME!='张三'
100 --统计每门课程的平均成绩,并按照成绩降序排序
101 select a.CNAME,avg(CMARK) from COURSE a,MARK b  where a.cid=b.CID group by CNAME order by avg(CMARK) desc
102 --查询“福建”地区学生所选修的全部课程名称
103 select  CNAME from STUDENT,MARK,COURSE
104 where STUDENT.sid=mark.sid and mark.cid=COURSE.cid and SNATIVEPLACE='福建'
105 --查询所在班级和该班内学生的年龄之和,对该班级中每个人的年龄进行比对，(要求大于20岁的人参与统计)
106 select a.SCLASS,sum(a.SAGE) from STUDENT a,STUDENT b where  a.sclass=b.sclass and sage >20  group by SCLASS
107 select a.SCLASS,sum(a.SAGE) from STUDENT a,STUDENT b where a.SAGE=b.SAGE and b.SAGE>20 group by a.SCLASS+
108 select SCLASS from STUDENT a,STUDENT b  where a. group by SCLASS
109 --5、查询所在班级和该班内学生的年龄之和,(要求该班级中每个人的年龄都大于20岁)
110 select a.SCLASS,sum(a.SAGE) from STUDENT a,STUDENT b where a.SAGE=b.SAGE and b.SAGE>20 group by a.SCLASS
111 男生与女生数学均分
112 select SSEX,trunc(avg(CMARK) ,2) from STUDENT s,MARK m,COURSE c
113 where s.sid=m.sid and m.cid=c.cid and CNAME='数学' and ssex is not null group by SSEX
114 数学每个分段多少人数
115 select trunc(CMARK/10)*10||'`'||(trunc(CMARK/10)*10+9),count(*) from STUDENT s,MARK m,COURSE c
116 where s.sid=m.sid and m.cid=c.cid and CNAME='数学' group by trunc(CMARK/10)
117 找出各科成绩及格与不及格的人数，要求表示课程名称0 不及格 1 及格
118 select (trunc(CMARk/60)||'`'||(trunc(CMARK/60)+1)) 1,    count(*) from STUDENT s,MARK m,COURSE c
119 where s.sid=m.sid and m.cid=c.cid and cmark/60>1 and CMARK/60<1 group by trunc(CMARk/60)
120 select cname,trunc(CMARK/60),count(*)
121 from  MARK m,COURSE c
122 where m.cid=c.cid
123 group by c.cid,CNAME,trunc(CMARK/60)
124 找出福建与安徽学生的数学均分
125   select SNATIVEPLACE,avg(CMARK)
126   from STUDENT s,MARK m,COURSE c
127   where s.sid=m.sid and m.cid=c.cid and CNAME='数学'and  (SNATIVEPLACE='福建 'or SNATIVEPLACE='安徽')
128   group by SNATIVEPLACE
129 
130 
131 找出福建与安徽的所有学生总分
132  select SNATIVEPLACE,sum(CMARK) from STUDENT s,MARK m,COURSE c
133   where s.sid=m.sid and m.cid=c.cid and (SNATIVEPLACE='福建'or SNATIVEPLACE='安徽')
134   group by SNATIVEPLACE
135 
136 找出福建与安徽的所有学生  各科总分
137 select CNAME,sum(CMARK) from STUDENT s,MARK m,COURSE c
138   where s.sid=m.sid and m.cid=c.cid and (SNATIVEPLACE='福建'or SNATIVEPLACE='安徽')
139   group by CNAME
140 
141 
142 
143  找出福建与安徽的所有学生每个学生总分
144         select SNATIVEPLACE,SNAME,sum(CMARK)
145         from STUDENT s,MARK m,COURSE c
146   where s.sid=m.sid and m.cid=c.cid and (SNATIVEPLACE='福建'or SNATIVEPLACE='安徽')
147   group by SNAME,SNATIVEPLACE
148 
149 
150 
151 子查询
152 select sid from STUDENT
153 where SNAME='张三'
154 select * from STUDENT
155 where SNATIVEPLACE=(select SNATIVEPLACE from STUDENT where SNAME='张三' )
156 找出数学成绩比张三高的男生姓名
157 select  SNAME from STUDENT
158 where SSEX='男' and CMARK=(select cmark from COURSE where SNAME='张三' and cmark=()    )
159 
160 select cid from COURSE
161 where CNAME='数学' and sid=
162                      (select sid from STUDENT where  SNAME='张三' and cmark=
163                                                                     (select CMARK from MARK where SNAME='张三' and sid=
164                                                                                                                  (select sid from STUDENT where SSEX='男')) )
165 select cid from COURSE
166 where CNAME='数学' sid=(select sid from STUDENT where sname='张三' cmark=(select CMARK from MARK where sid= ))
167 stp1 在course表找数学cid
168 select cid from COURSE where CNAME='数学'
169 2 在student中找张三的sid
170 select sid from STUDENT where SNAME='张三'
171 3 在mark中找出张三数学成绩
172 select CMARK from MARK where sid=(2) and cid=(1)
173 4 在mark中找出比张三高的人sdi
174 select  sid from MARK where CMARK>(3) and cid=(1)
175 5在student中找出姓名，男性
176 select SNAME from STUDENT where sid in(4) and ssex='男'
177  select SNAME from STUDENT where sid in(
178    select  sid from MARK where CMARK>(
179      select CMARK from MARK where sid=(
180        select sid from STUDENT where SNAME='张三') and cid=(
181          select cid from COURSE where CNAME='数学')) and cid=(
182           select cid from COURSE where CNAME='数学')
183   ) and ssex='男'
184 找出均分比张三高的男生姓名
185  select sid from STUDENT where SNAME='张三'
186 均分
187  select avg(CMARK) from MARK where
188 
189 
190 
191 找出最大年龄姓名
192 select max(sage) from STUDENT
193 select sname from select where age=(select max(sage) from STUDENT )
194 
195 select * from mark group by sid
196 
197 
198 找出六老师学生数学最高分姓名
199 
200 select TID from TEACHER where TNAME='马六'
201 数学
202 select CID from COURSE where  tid='30001' and CNAME='数学'
203 最高分数
204 
205 select max(CMARK) from MARK where cid=2001
206 select sid from MARK where CMARK=97
207 姓名
208 
209 select SNAME from STUDENT where sid=10008
210 select SNAME from STUDENT where sid in(
211   select sid from MARK where CMARK=(
212     select max(CMARK) from MARK where cid=(
213       select CID from COURSE where  CNAME='数学' and tid=(
214         select TID from TEACHER where TNAME='马六'
215        )
216      )
217    )
218 
219  )
220 张三地区
221  SELECT SNATIVEPLACE FROM STUDENT WHERE SNAME='张三'
222 
223 同学
224  select sid from STUDENT where SNATIVEPLACE in (1)
225 select cid from COURSE where CNAME='数学'
226 
227 select max(CMARK) from MARK where CID=() SID in (2)
228 select sid from MARK where  CMARK=(3)
229 select  SNAME from STUDENT where SID=(4)
230 数学成绩
231 select  SNAME from STUDENT where SID=(
232  select sid
233  from MARK
234  where CMARK = (
235    select max(CMARK) from MARK where CID=(
236      select cid from COURSE where CNAME='数学'
237      ) and SID in (
238                                      select sid from STUDENT where SNATIVEPLACE in (
239                                      SELECT SNATIVEPLACE FROM STUDENT WHERE SNAME='张三'
240                                      )
241                                      )
242 
243   )
244 )
245 
246 
247 找出均分最高的姓名
248 1 找出均分表
249 select sid ,avg(CMARK) amk from MARK group by SID
250 2 找出最高
251 select max(amk) from (1)
252 3 在均分表中，谁的均分等于最高分
253 select sid from (1) where amk=(2)
254 select name from STUDENT
255 
256 select sid from (select sid ,avg(CMARK) amk from MARK group by SID) where amk=(select max(amk) from (select sid ,avg(CMARK) amk from MARK group by SID))
257 
258 select sid ,avg(cmark) m from mark  where group by SID
259 select min(m) from (1)
260 select  sid from (1) where m=(2)
261 select SNAME from STUDENT where sid=(3)
262 
263 select ROWNUM,s.*  from STUDENT s where ROWNUM<=10
264 select SAGE,max()
265 select SAGE from STUDENT order by desc
266 select  * from () where ROWNUM=1
267 
268 select  * from (select * from STUDENT order by desc ) where ROWNUM=1
269 找出年龄从大到小第5至8 学生信息
270 select * from STUDENT where ROWNUM<=8 order by SAGE  desc
271 select  * from STUDENT where ROWNUM <=4 order by SAGE
272 
273 select  * from (select * from STUDENT where ROWNUM<=8 order by SAGE  desc) where ROWNUM <=4 order by SAGE asc
274 找出均分高到低5到8 学生信息
275 select
276 1　 与“张三”同乡的男生姓名
277 select SNATIVEPLACE from STUDENT where SNAME='张三'
278 select sid from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from STUDENT where SNAME='张三')
279 select SNAME from STUDENT where sid (2).
280 select SNAME from STUDENT where sid in (
281 select sid from STUDENT where SNATIVEPLACE=(
282 select SNATIVEPLACE from STUDENT where SNAME='张三'
283  )
284  )
285 选修了马六老师所讲课程的学生人数
286 1.赵露老师techer 求tid
287  select tid from TEACHER where TNAME='马六'
288 
289  2.tid cid
290    select cid from COURSE where tid in (select tid from TEACHER where TNAME='马六')
291    cid sid
292 
293    select sid   from MARK where cid= 2001
294     sid count
295    select count(*) from STUDENT where sid in (select sid   from MARK where cid= 2001)
296 
297 
298 
299 查询没学过“胡”姓老师课的同学的学号、姓名
300 模糊查询胡老师，tid
301 select tid from TEACHER where TNAME like '胡%'
302 tid cid
303  select  cid from COURSE where tid  in ()
304 
305 cid sid
306 select sid from MARK where  cid in ()
307 
308 sid 名字，学号
309 select SNAME,sid from STUDENT where sid in ()
310 
311 select SNAME,sid from STUDENT where sid not in (
312   select sid from MARK where cid in  (
313     select  cid from COURSE where tid in (
314       select tid from TEACHER where TNAME like '胡%'
315      )
316    )
317  )
318 
319 “数学”课程得最高分的学生姓名、性别
320 数学cid
321   select cid from COURSE where CNAME='数学'
322 
323 
324 最高分
325   select max(CMARK) from MARK where cid in ()
326 
327 姓名
328    select sid from MARK where CMARK in ()
329   select sid,SNAME from STUDENT where sid=()
330 
331 select sid,SNAME from STUDENT where sid=(
332   select sid from MARK where CMARK in (
333     select max(CMARK) from MARK where cid in (
334       select cid from COURSE where CNAME='数学'
335      )
336    )
337  )
338 
339 统计每门课程的平均成绩,并按照成绩降序排序
340 select cid,avg(cmark)   from mark group by cid
341 select czg  from (select cid,avg(cmark) czg  from mark group by cid) order by czg desc
342 
343 select * from czg order by desc
344 
345 子查询实现查询‘3-2班’"张三"同学的"英语"成绩
346 select sid from STUDENT where SNAME='张三'
347 select cid from COURSE where CNAME='英语'
348 select CMARK from MARK where sid =() and cid=()
349 
350 select CMARK from MARK where sid =(
351   select sid from STUDENT where SNAME='张三'
352  ) and cid=(
353    select cid from COURSE where CNAME='英语'
354  )
355 
356 查询“福建”地区学生所选修的全部课程名称
357 select SNATIVEPLACE from STUDENT where SNATIVEPLACE='福建'
358 select sid from STUDENT where SNATIVEPLACE='福建'
359 
360 select cid from MARK where sid in ()
361 select CNAME from COURSE where cid in (
362   select cid from MARK where sid in (
363   select sid from STUDENT where SNATIVEPLACE='福建'
364  )
365  )
366 
367 用子查询实现查询选修“数学”课的全部学生的数学总成绩
368 select cid from COURSE where CNAME='数学'
369 select sid from MARK where cid in ()
370 select sum(CMARK) from MARK where sid in()
371 select sum(CMARK) from MARK where sid in(
372   select sid from MARK where cid in (
373     select cid from COURSE where CNAME='数学'
374    )
375  ) and cid =(select cid from COURSE where CNAME='数学')
376 用子查询实现查询选修“高等数学”课的全部学生的所有课程总成绩高等数学总成绩
377 select cid from COURSE where CNAME='数学'
378 select sid from MARK where cid in (2001)
379 --select cid from COURSE where sid in ()
380 select sum(CMARK) from MARK where cid in ()
381 
382 select sum(CMARK) from MARK where sid in (
383     select sid from MARK where cid in (
384       select cid from COURSE where CNAME='数学'
385      )
386    )
387 
388 
389 
390 请用两种方法实现:查找所有成绩都在68分以上的学生姓名
391 select sid,min(CMARK)  from MARK  group by sid having min(CMARK)<68
392 select min(CMARK) from MARK group by  sid
393 select sid from (select min(CMARK) from MARK group by  sid
394 
395                  ) where cmark>68
396 查找至少2门成绩在80分以上的学生姓名
397 select sid from MARK group by SID
398 select cid from MARK where CMARK>80
399 select  sid from MARK where cid=()
400 select sid,count(*) c from MARK where CMARK> 80 group by sid
401 select sid from (select sid,count(*) c from MARK where CMARK> 80 group by sid ) where c>2
402 select SNAME from STUDENT where sid in ()
403 
404 
405 查询个人平均总成绩小于平均总成绩的学生姓名
406 select avg(CMARK) c from MARK m
407 select sid,avg(CMARK) z from MARK m group by sid;
408 select sid from (select avg(CMARK) c from MARK m),(select sid,avg(CMARK) z from MARK m group by sid) WHERE Z>C
409 
410 用子查询实现张三在其各科成绩中最高分成绩所对应的课程号和成绩
411 select SID from STUDENT where SNAME='张三'
412 
413 select cid,CMARK c from MARK x where sid=(select SID from STUDENT where SNAME='张三')
414 select max(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三'));
415 select CID,CMARK from MARK where sid=(select SID from STUDENT where SNAME='张三')
416         and cmark=(select max(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三')))
417 
418 8　找出张三的最高分和最低分以及对应的课程名
419 
420 select max(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三'));
421 select min(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三'));
422 select cid from MARK
423 where sid=(select SID from STUDENT where SNAME='张三')
424 and
425  (CMARK=(select max(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三')))OR
426   CMARK=(select min(CMARK) from (select cid,CMARK  from MARK x where sid=(select SID from STUDENT where SNAME='张三'))))
427 
428 分页查询
429 找出没有数学课的学生姓名
430 select cid from COURSE where CNAME='数学'
431 select sid from MARK where cid  in ()
432 select SNAME from STUDENT where sid not in ()
433 select SNAME from STUDENT where   sid not   in (
434   select sid from MARK where cid  in (
435     select cid from COURSE where CNAME='数学'
436     )
437   )
438 
439 找出各科成绩均比张三高的学生姓名
440 组合表
441  select * from MARK a,MARK b where a.cid=b.cid  and b.sid=10002
442  select max(CMARK) c from MARK where sid=10002
443 张三 选修的cid
444 select sid,min(CMARK)z  from ( select * from MARK a,MARK b where a.cid=b.cid  and b.sid=10002 )
445 where c.max(CMARK)446   group by SID
447 
448 cid sid
449 
450 select sid,min(CMARK) from MARK group by sid
451 组合表格，选课有重复
452 s1  select a.sid sid1 ,b.sid sid2,a.cid cid1 ,a.CMARK cmarka,b.CMARK cmarkb
453            from MARK a,MARK b where a.cid=b.cid  and b.sid=10002
454 在表找至少有一门成绩低于张三的
455 s2   select sid1 from (s1) where cmarka456 
457 select sid from (1) where b.sid458 在排除低于的
459 s3 select sid1  from (s1) where cid1 not in (2)
460 
461 找年龄最大的
462 年龄排序
463  select * from STUDENT order by sage desc
464 
465 取第一个
466 select * from (1) where  ROWNUM=1
467 
468 找出最大，在问谁等于最大
469 
470 select max(SAGE) from STUDENT
471 select * from student where sage =()
472 
473 我的年龄比所有人大包括自己
474 1 找出所有人
475 select SAGE from STUDENT where SAGE is not null
476  2扫描学生表，和所有人年龄进行比对
477 select * from STUDENT where  not SAGEnull
478 
479 
480 找出张三选课内容完全相同的
481 1 找出张三sid
482 
483 2找出cid
484   select sid from MARK where sid=(1)
485 
486 3张三没选cid
487 select cid from MARK where cid not in (2)
488 4
489 谁选了张三未选的si
490 select sid from MARK where cid in (3)
491 5找出张三课程数量
492  select  * from MARK where sid =(1)
493 6比课程
494 select sid from MARK where sid not in (4)
495 group by sid having count(*) = (5)
496 7 替换姓名
497 select SNAME from STUDENT where SID in (6)
498 
499 
500 找出张三数学英语成绩 显示数学英语姓名三列
501 select SNAME,(
502   select CMARK from MARK where sid=10002 and cid=2001
503   )数学成绩,(
504      select CMARK from MARK where sid=10002 and cid=2002
505   )英语成绩
506 from STUDENT
507 where SNAME='张三'
508 查询所有人数学英语成绩
509 select SNAME,(
510   select CMARK from MARK where sid=s.sid and cid=2001
511   )数学成绩,(
512      select CMARK from MARK where sid=s.sid and cid=2002
513   )英语成绩
514 from STUDENT s
515 
516 
517 exists存在
518 where  exists (select ..) 存在一个就是ture
519 where  not exists (select ..)
520       如果我是年龄最大的，那么一定不存在有人比我大
521       select * from STUDENT s where not exists(
522         select * from STUDENT where sage>s.SAGE
523         )
524 
525 找出选修所有的课程
526 select * from STUDENT s where not exists(
527   select * from COURSE c where not exists(
528     select * from MARK where sid=s.sid and c=c.cid
529     )
530   )
531 
532 集合运算
533 集合运算就是将两个或者多个结果集组合成为一个结果集。集合运算包括:
534 INTERSECT(交集)，返回两个查询共有的记录。
535 UNION ALL(并集)，返回各个查询的所有记录，包括重复记录。
536 UNO(并集)，返回各个查询的所有记录，不包括重复记录。
537 MINUS(补集)返回第一个查询检索出的记录减去第二个查询检索出的记录之后剩余的记录。
538 当使用集合运算时，要注意:查询所返回的列数以及列的类型必须匹配，列名可以不同
539 并集
540 select SNAME,SAGE from STUDENT where SAGE in(19,21)
541 union
542 select SNAME,SAGE from STUDENT where SAGE in(20,22)
543 
544 并集
545 select SNAME,SAGE from STUDENT where SAGE in(19,21)
546 union all
547 select SNAME,SAGE from STUDENT where SAGE in(20,22)
548 交集
549   select SNAME,SAGE from STUDENT where SAGE in(19,21)
550 intersect
551 select SNAME,SAGE from STUDENT where SAGE in(20,22)
552 
553 补集
554  select SNAME,SAGE from STUDENT where SAGE in(19,21)
555 minus
556 select SNAME,SAGE from STUDENT where SAGE in(20,22)
557 
558 找出福建除最高和最低的平均年龄
559 select sid from STUDENT where SNATIVEPLACE='福建'
560 select max(SAGE) from STUDENT where sid in (select sid from STUDENT where SNATIVEPLACE='福建')
561 union
562 select min(SAGE) from STUDENT where SNATIVEPLACE='福建'
563 select sid,avg(SAGE) from STUDENT where sid in ()
564 
565 select sid,avg(SAGE) from STUDENT where sid in (
566   select max(SAGE) from STUDENT where sid not in (
567     select sid from STUDENT where SNATIVEPLACE='福建'
568     )
569 union
570 select min(SAGE) from STUDENT where sid in (
571   select sid from STUDENT where SNATIVEPLACE='福建'
572     )
573 
574   )
575 1找出福建最高年龄
576  select max(SAGE) from STUDENT where SNATIVEPLACE='福建'
577  select sid from STUDENT where SAGE=( select max(SAGE) from STUDENT where SNATIVEPLACE='福建')
578 2找出福建最低年龄
579 select min(SAGE) from STUDENT where SNATIVEPLACE='福建'
580 select sid from STUDENT where SAGE=(select min(SAGE) from STUDENT where SNATIVEPLACE='福建')
581 3union连接
582  select max(SAGE) from STUDENT where SNATIVEPLACE='福建'
583  union
584  select min(SAGE) from STUDENT where SNATIVEPLACE='福建'
585 4 找出福建地区学生，并去除3中学生，剩下的平均年龄
586 select sid from STUDENT where sid not in (
587   select sid from STUDENT where SAGE=(select min(SAGE) from STUDENT where SNATIVEPLACE='福建')
588   union
589   select sid from STUDENT where SAGE=( select max(SAGE) from STUDENT where SNATIVEPLACE='福建')
590   )
591 select avg(SAGE) from STUDENT where sid in (
592   select sid from STUDENT where sid not in (
593   select sid from STUDENT where SAGE=(select min(SAGE) from STUDENT where SNATIVEPLACE='福建')
594   union
595   select sid from STUDENT where SAGE=( select max(SAGE) from STUDENT where SNATIVEPLACE='福建')
596   )
597   )
598 
599 按平均成绩从高到低显示所有学生的“数学”、“英语”、“语文”三门的课程成绩(按如下形式显示:学生ID,高等数学,计算机数学,英语,有效课程数,有效平均分 )
600 select SNAME,(
601   select CMARK from MARK where sid=s.sid and cid=2001
602   )数学成绩,(
603      select CMARK from MARK where sid=s.sid and cid=2002
604   )英语成绩,
605        (select cmark from MARK where sid =s.sid and cid =
606 from STUDENT s
607 查询各科成绩前三名的记录:(不考虑成绩并列情况)
608 课程名   第一名   第二名   第三名;
609 select * from MARK where  ROWNUM=1 order by CMARK desc
610 select * from MARK where  ROWNUM=1   order by CMARK desc
611 查找至少2门成绩在80分以上的学生姓名
612 select
613 
614 
615 
616 
617 
618 --34谁的各科成绩均高于各科均分
619 select CID,avg(CMARK)  amk from MARK m group by CID;
620 --S2
621 select m1.sid,count(*) c from MARK m1,(select CID,avg(CMARK)  amk from MARK m group by CID) m2
622 where m1.CID=m2.cid and m1.CMARK>m2.amk group by m1.sid;
623 --s3
624 select sid from (select m1.sid,count(*) c from MARK m1,(select CID,avg(CMARK)  amk from MARK m group by CID) m2
625 where m1.CID=m2.cid and m1.CMARK>m2.amk group by m1.sid) where c=7;
626 --s4
627 select SNAME from STUDENT where SID in (select sid from (select m1.sid,count(*) c from MARK m1,(select CID,avg(CMARK)  amk from MARK m group by CID) m2
628 where m1.CID=m2.cid and m1.CMARK>m2.amk group by m1.sid) where c=7)
629 
630 -33求各门课程去掉一个最高分和最低分后的平均分
631 --s1
632 select CID,MAX(CMARK) 最高分 ,MIN(CMARK) 最低分 from MARK group by CID;
633 --s2
634 select m1.CID,CMARK from MARK m1,(select CID,MAX(CMARK) 最高分 ,MIN(CMARK) 最低分 from MARK group by CID) m2
635 where m1.CID=m2.CID and m1.CMARK!=m2.最高分 and CMARK!=m2.最低分;
636 --s3
637 select CID,AVG(CMARK) from (select m1.CID,CMARK from MARK m1,(select CID,MAX(CMARK) a ,MIN(CMARK) b from MARK group by CID) m2
638 where m1.CID=m2.CID and m1.CMARK!=m2.a and CMARK!=m2.b)
639 group by CID;
640 --32上海地区哪门课的均分比福建差
641 --s1
642 select sid from STUDENT where SNATIVEPLACE='上海';
643 --s2
644 select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='上海') group by CID;
645 --s3
646 select sid from STUDENT where SNATIVEPLACE='福建';
647 --s4
648 select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='福建') group by CID;
649 --s5
650 select  a.CID
651 from (select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='上海') group by CID) a,
652 (select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='福建') group by CID) b
653 where a.CID=b.CID and a.amk654 --s6
655 select CNAME FROM COURSE where CID in (select  a.CID
656 from (select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='上海') group by CID) a,
657 (select cid,avg(CMARK) amk from MARK where sid in (select sid from STUDENT where SNATIVEPLACE='福建') group by CID) b
658 where a.CID=b.CID and a.amk659 --30找出数学和英语均分最高的男生姓名
660 --S1
661 select CID 科目 from COURSE where CNAME='数学'
662 union
663 select CID from COURSE where CNAME='英语';
664 --s2
665 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
666 union
667 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID;
668 --s3
669 select sid,avg(amk) am
670 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
671 union
672 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
673 group by SID;
674 --s4
675 select max(am) from (select sid,avg(amk) am
676 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
677 union
678 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
679 group by SID);
680 --s5
681 select sid from (select sid,avg(amk) am
682 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
683 union
684 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
685 group by SID) where am=(select max(am) from (select sid,avg(amk) am
686 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
687 union
688 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
689 group by SID));
690 --s6
691 select SNAME from STUDENT
692 where Sid in (select sid from (select sid,avg(amk) am
693 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
694 union
695 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
696 group by SID) where am=(select max(am) from (select sid,avg(amk) am
697 from (select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='数学')group by SID
698 union
699 select sid,avg(CMARK) amk from MARK m where CID=(select CID from COURSE where CNAME='英语')group by SID)
700 group by SID)));
701 --29　请显示张三同学的数学和英语成绩,要求显示姓名，数学成绩，英语成绩
702 select SNAME 学生姓名,(select CMARK from MARK where cid=2001 and sid=10001) 数学成绩,(select CMARK from MARK where cid=2002 and sid=10001) 英语成绩
703 from STUDENT where sname='张三';
704 --28数学状元的同班同学中男生均分最高的学生姓名
705 --s1
706 select cid from COURSE where CNAME='数学';
707 --s2
708 select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学');
709 --s3
710 select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'));
711 --s4
712 select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
713 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学')));
714 --s5
715 select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
716 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))));
717 --s6
718 select sid from STUDENT where SCLASS=(select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
719 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
720 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
721 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))));
722 --s7
723 select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
724 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
725 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
726 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid;
727 --s8
728 select max(am) from (select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
729 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
730 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
731 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid);
732  --s9
733  select SID from (select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
734 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
735 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
736 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid)
737  where am=(select max(am) from (select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
738 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
739 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
740 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid));
741 --s10
742 select SNAME from STUDENT where SID in (select SID from
743  (select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS from STUDENT
744  where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
745 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
746 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
747 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid)
748  where am=(select max(am) from (select sid,avg(CMARK) am FROM MARK where SID in (select sid from STUDENT where SCLASS=(select SCLASS
749  from STUDENT where SID=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
750 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) and SSEX='男' and
751 sid!=(select sid  from(select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))
752 where CMARK=(select max(CMARK) from (select sid,CMARK from MARK where CID=(select cid from COURSE where CNAME='数学'))))) group by sid)));
753 --27　男生人数最多的地区中哪个学生年龄最大
754 --s1
755 select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE;
756 --s2
757 select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE);
758 --s3
759 select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
760 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE));
761 --s4
762 select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
763 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)));
764 --s5
765 select max(sAGE) from (select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
766 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE))));
767 --s6
768 select sid from (select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
769 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE))))
770 where SAGE=(select max(sAGE) from (select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
771 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)))));
772 --s6
773 select SNAME from STUDENT where SID in (select sid from (select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
774 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE))))
775 where SAGE=(select max(sAGE) from (select sid,SAGE from STUDENT where SNATIVEPLACE=(select SNATIVEPLACE from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE)
776 where cu in (select max(cu) from (select SNATIVEPLACE,count(*) cu from STUDENT s group by SNATIVEPLACE))))));
777 select sid 学生id ,(select cmark from mark where cid=
778 (select cid from course where cname='数学') and sid=sc.sid) 数学 ,(select cmark from mark where cid=
779 (select cid from course where cname='英语')and sid=sc.sid) 英语,count(*) 有效课程数,avg(cmark) 有效均分
780 from mark sc group by sid
781 --1.与“张三”同乡的男生姓名
782 1.
783 select SNATIVEPLACE from STUDENT where SNAME='张三'
784 2.
785 select sid from STUDENT where SNATIVEPLACE=()
786 3.
787 select SNAME from STUDENT where sid in ()
788 --
789 select SNAME from STUDENT where sid in (
790   select sid from STUDENT where SNATIVEPLACE=(
791     select SNATIVEPLACE from STUDENT where SNAME='张三'
792     )
793 
794   )
795 --2.选修了胡适老师所讲课程的学生人数
796 1.
797 select tid from TEACHER where TNAME='胡适'
798 2.
799 select cid from COURSE where tid in ()
800 3;
801 select sid from MARK where cid in ()
802 4.
803 select SNAME from STUDENT where sid in ()
804 
805 5
806 select SNAME from STUDENT where sid in (
807   select sid from MARK where cid in (
808     select cid from COURSE where tid in (
809       select tid from TEACHER where TNAME='胡适'
810 
811       )
812     )
813   )
814 --3.查询没学过“胡”姓老师课的同学的学号、姓名
815 1.
816 select tid from TEACHER where TNAME like '胡%'
817 2.
818 select cid from COURSE where tid in (select tid from TEACHER where TNAME like '胡%')
819 3.
820 select sid from MARK where cid  in (2002,2004)
821 4.
822 select SNAME from STUDENT where sid in ()
823 5.
824 select SNAME from STUDENT where sid not  in (
825   select sid from MARK where cid in (
826     select cid from COURSE where tid in (
827       select tid from TEACHER where TNAME like '胡%'
828       )
829     )
830   )
831 --4“数学”课程得最高分的学生姓名、性别
832 1
833 select cid from COURSE where CNAME='数学'
834 2
835 select max(CMARK) from MARK where cid=()
836 3.
837 select sid from MARK where CMARK in ()
838 4.
839 select SNAME,SSEX from STUDENT where  sid in ()
840 5.
841 select SNAME,SSEX from STUDENT where  sid in (
842   select sid from MARK where CMARK in (
843     select max(CMARK) from MARK where cid=(
844       select cid from COURSE where CNAME='数学'
845       )
846     )
847   )
848 --5统计每门课程的平均成绩,并按照成绩降序排序
849 select avg(CMARK) from MARK group by cid order by avg(CMARK) desc
850 
851 -17　用子查询实现张三在其各科成绩中最高分成绩所对应的课程号和成绩
852 1.
853 select sid from STUDENT where SNAME='张三'
854 2.
855 select max(CMARK) from MARK where sid = ()
856 3.
857 select cid from MARK where sid =()
858 and CMARK=()
859 4
860 
861 select cid,CMARK from MARK where sid =(
862   select sid from STUDENT where SNAME='张三'
863   )
864 and CMARK=(
865   select max(CMARK) from MARK where sid = (
866     select sid from STUDENT where SNAME='张三'
867     )
868     )
869 
870 --33求各门课程去掉一个最高分和最低分后的平均分
871 --s1
872 select CID,MAX(CMARK) a ,MIN(CMARK) b from MARK group by CID;
873 --s2
874 select m1.CID,CMARK from MARK m1,(select CID,MAX(CMARK) a ,MIN(CMARK) b from MARK group by CID) m2
875 where m1.CID=m2.CID and m1.CMARK!=m2.a and CMARK!=m2.b;
876 --s3
877 select CID,AVG(CMARK) from (select m1.CID,CMARK from MARK m1,(select CID,MAX(CMARK) a ,MIN(CMARK) b from MARK group by CID) m2
878 where m1.CID=m2.CID and m1.CMARK!=m2.a and CMARK!=m2.b)
879 group by CID;
880 
881 
882 select sid
883 from STUDENT where SNAME='张三'
884 select a.sid from MARK a,MARK b where a.cid=b.sid and b.sid=() and a.CMARK<=b.CMARK
885 select sid from MARK where sid not in ()
886 select SNAME from STUDENT where sid in ()
887 
888 select sid 学生id ,(select cmark from mark where cid=
889 (select cid from course where cname='数学') and sid=sc.sid) 数学 ,(select cmark from mark where cid=
890 (select cid from course where cname='英语')and sid=sc.sid) 英语,count(*) 有效课程数,avg(cmark) 有效均分
891 from mark sc group by sid
892 
893 select sid from STUDENT where SNATIVEPLACE='上海'
894 select cid,avg(CMARK) amk  from MARK where sid in ()
895 
896 select sid from STUDENT where SNATIVEPLACE='福建'
897 select cid,avg(CMARK) amk  from MARK where sid in ()
898 
899 select a.cid from () where a.cid=b.cid and a.cmk900 
901 2019/7/22
902 ---将每个同学的成绩降序排序 开窗
903 select m.*,rank() over (partition by SID order by CMARK desc ) from MARK m
904 select m.*,dense_rank() over (partition by SID order by CMARK desc ) id1,
905        rank() over (partition by SID order by CMARK desc) id2 from MARK m
906 
907 找出各个地区各门课均分，各个地区集中显示，均分降序排序
908 1.
909 select SNATIVEPLACE from STUDENT group by SNATIVEPLACE
910 select sid from STUDENT where SNATIVEPLACE in (select SNATIVEPLACE from STUDENT group by SNATIVEPLACE)
911 select avg(CMARK)  from ()
912 
913 2,
914 select avg(CMARK) from MARK where
915 select SNATIVEPLACE,CNAME,avg(CMARK) amk,row_number() over (
916   partition by SNATIVEPLACE order by avg(CMARK) desc )
917   id1_row_number,
918 rank() over (
919   partition by SNATIVEPLACE order by avg(CMARK) desc
920   )id2_rank,dense_rank() over (
921     partition by SNATIVEPLACE order by avg(CMARK) desc
922   )
923 
924 from STUDENT s,MARK m,COURSE c
925 where s.sid=m.sid and m.sid=c.sid
926 group by snativeplace, cname
927 
928 select SNATIVEPLACE,CNAME,amk,max(amk) over (partition by SNATIVEPLACE),
929        min(amk) over ( partition by SNATIVEPLACE)
930  first_value() over
931 from(
932     select SNATIVEPLACE,CNAME,avg(CMARK) amk,
933            row_number() over (
934              partition by SNATIVEPLACE order by avg(CMARK) desc
935              ) id_row_number,
936            rank() over (
937              partition by SNATIVEPLACE order by avg(amk)  desc
938              ) id2_rank,
939            dense_rank() over (
940              partition by SNATIVEPLACE order by avg(amk)  desc
941              ) id3_dense_rank
942   from STUDENT s,MARK m,COURSE c
943 where s.sid=m.sid and m.sid=c.sid
944 group by snativeplace, cname
945 
946       )格式，连接查询
947       select  * from STUDENT s,MARK m where s.sid=m.sid
948 
949 select * from STUDENT s inner join MARK m on s.sid=m.sid--内连，交集
950 select * from STUDENT s left outer join MARK m on s.sid=m.sid--外联
951 
952 
953 select SNAME,SSEX,amk from STUDENT s left outer join (
954   select sid,avg(CMARK) amk from MARK group by sid
955   ) m on s.sid=m.sid
956 where SSEX='男'
957 
958 
959 select SNAME,SSEX,amk from STUDENT s full outer join (
960   select sid,avg(CMARK) amk from MARK group by sid
961   ) m on s.sid=m.sid and SSEX='男'
962 --sql 语言
963 DDL 对结构进行操作 create drop alter  drop database Data Define Language
964 DML 对数据进行操作 insert delete update             Data MANAGEMENT Language
965 DQL 对数据查询                                      Data Query Language
966 
967 DCL                                                  Data control Language
968 TCL                                                   Transaction Control Languc
969 
970 create table STUDENTq(sid number(5,0) , ssex char(2),sage number(10)
971                     )
972 insert into STUDENTq(sid,ssex,ssage) values (10005222,'男',20);
973 
974 select * from STUDENT
975 drop table studentq
976 insert into STUDENT(SNAME,SAGE) values ('张伟',21)---添加
977 commit --确当数据，提交
978 
979 create table stu33 as------复制表
980   select * from STUDENT where ssex='男'
981 
982 select * from stu33
983 
984 
985   drop table newstu2
986 
987 
988 
989 insert into stu1
990 select * from STUDENT where sage>=20
991 
992 select * from newwtu2
993 
994 
995 数据的删除
996 delete from STUDENT where 1=1
997 
998 select ROWID,s.* from STUDENT s---内存地址
999 --删除重复数据
1000 delete from STUDENT
1001 where ROWID not in (
1002   select min(ROWID) from STUDENT
1003   group by sid
1004   )
1005 
1006 commit
1007 
1008 select sid from STUDENT where SNATIVEPLACE='安徽'
1009 select cid from COURSE where CNAME='数学'
1010 修改，多个属性，加，
1011 
1012 来自安徽的均分低于70，数学成绩+5
1013 update  MARK
1014 set CMARK=CMARK+5
1015 where cid=(
1016   select cid from COURSE where CNAME='数学') and sid in(
1017     select sid from MARK
1018     where sid in (
1019       select sid from STUDENT where SNATIVEPLACE='安徽'
1020       ) group by sid having avg(CMARK) <70
1021   )
1022 
1023 
1024 select  mod(12,5)from DUAL
1025 create table stu2 ( sname
1026                       varchar2(80),
1027                       birth date
1028 
1029   )
1030 select * from STU2
1031 insert into stu2 (sname ,birth) values('张三',to_date('2019-5-5','YYYY-MM-DD'))
1032 
1033 select sysdate,
1034        extract(YEAR FROM sysdate),
1035        extract(MONTH FROM sysdate),
1036        extract( DAY sysdate)
1037 FROM DUAL
1038 create table reader(rname number(100),rsex char(3),
1039                     )
1040 insert into STUDENTq(sid,ssex,ssage) values (10005222,'男',20);
1041 --to_date插入日期和时间用的
1042  insert into stu2(sname birth)
1043    values('张三',to_date('2019/5/21 16:55:56','YYYY/MM/DD HH24:MI:SS'))
1044 --sysdate sysadte+1加一天的时间 sysdate+1/24加一小时 其他以此类推
1045 select sysdate from dual
1046 --用现在的时间减去你的生日得到你从出生到现在过了多久
1047 select s.*,sysdate-birth from stu2 s
1048 
1049 
1050 --extract 单取出年月日
1051   select sysdate(
1052     extract(year from sysdate)
1053     extract(month from sysdate)
1054     extract(day from sysdate)
1055   )
1056 from dual
1057 
1058 --算岁数
1059  select sysdate(
1060     extract(year from sysdate)-extract(year from birth)+1
1061   )
1062 from dual
1063 
1064 select last_day(sysdate) from dual
1065 
1066 
1067 
1068 作者表
1069 create table writer (
1070  wsid char(100),wname  char(50),wsex char(3),warea varchar2(100) ,wtelephone char(100),wid char(100),wtotal varchar2(100),wword varchar2 (100),wnote varchar2(100)
1071 
1072 
1073   )
1074 
1075 
1076 select * from WRITER
1077 
1078 
1079 insert into writer values ('001','唐三','男','徐州','18851923638','3203821958265805456','107万','174万','18444')
1080 insert into writer values ('002','土豆','男','南京','18851923635','320382195826580486','105万','141万','1845')
1081 insert into writer values ('003','番茄','女','上海','18851923635','320382195826585586','104万','147万','184844')
1082 insert into writer values ('004','五一','女','南京','18851923634','320382195826580576','108万','177万','18445')
1083 insert into writer values ('005','胡歌','男','长春','188519236378','320382195826580786','152万','152万','1875')
1084 insert into writer values ('006','西瓜','男','徐州','18851923638','3203821958265804456','1474万','14万','1844')
1085 insert into writer values ('007','独角','男','南京','18851923635','3203821958265450486','14万','151万','184')
1086 insert into writer values ('008','南瓜','女','西藏','18851923635','3203821958885586','17万','14万','1848')
1087 insert into writer values ('009','东瓜','女','香港','18851923634','320382198826580576','18万','147万','185')
1088 insert into writer values ('0010','','男','长春','188519236378','3203821957826580786','15万','14万','185')
1089 
1090 drop table writer
1091 打赏表
1092 mony
1093 create table mony(
1094   wsid char(100),mbook char(100),mmony char(100)
1095   )
1096 select * from mony
1097 
1098 insert into mony valus('001','斗破苍穹','100万')
1099 insert into mony values('002','圣墟','125万')
1100 insert into mony values('003','霸道总裁爱上我','245万')
1101 insert into mony values('004','高冷男神','152万')
1102 insert into mony values('005','我是流氓','1424万')
1103 insert into mony valu('006','斗破苍穹2','100万')
1104 insert into mony values('007','明朝','125万')
1105 insert into mony values('008','王子','245万')
1106 insert into mony values('009','汉朝','152万')
1107 insert into mony values('0010','981','1424万')
1108 作者等级
1109 grade
1110 create table grade (
1111 wsid char(100),ggrade char(100)
1112 )
1113 insert into grade values ('001','大神')
1114 insert into grade values ('002','大神')
1115 insert into grade values ('003','封圣')
1116 insert into grade values ('004','大神')
1117 insert into grade values ('005','小白')
1118 select * from grade
1119 
1120 排行榜
1121 list
1122 create table wlist (
1123   wsid char(100),wname char(100),lrank char(100)
1124 
1125 )
1126 select * from wlist
1127 insert into wlist values('001','斗破苍穹','1')
1128 insert into wlist values('002','圣墟','2')
1129 insert into wlist values('003','霸道总裁爱上我','3')
1130 insert into wlist values('004','高冷男神','4')
1131 insert into wlist values('005','我是流氓','5')
1132 insert into wlist values('006','斗破苍穹2','6')
1133 insert into wlist values('007','明朝','7')
1134 insert into wlist values('008','王子','8')
1135 insert into wlist values('009','汉朝','9')
1136 insert into wlist values('0010','981','10')
1137 
1138 drop table list
1139 
1140 
1141 随机0到100的整数
1142 select trunc(DBMS_random. value*100) from dual
1143 
1144 select systimestamp from dual
1145 select to_date('2018-7-5','yyy-mm-dd'), to_date ('2018-7-5','yyy-mm-dd') + interval '7' hour from dual
1146 
1147 CREATE SEQUENCE stuq
1148 MINVALUE 10005
1149 START WITH 10005
1150 MAXVALUE  100000
1151 INCREMENT BY 1
1152 NOCYCLE
1153 CACHE 30
1154 
1155 create table stua(
1156   sid number primary key,
1157   sname varchar2(20)
1158 )
1159 insert into stua values(stuq.NEXTVAL,'小明');
1160 insert into stua values(stuq.NEXTVAL,'小张');
1161 insert into stua values(stuq.NEXTVAL,'小明');
1162 insert into stua values(stuq.NEXTVAL,'小张');
1163 insert into stua values(stuq.NEXTVAL,'小明');
1164 insert into stua values(stuq.NEXTVAL,'小张');
1165 insert into stua values(stuq.NEXTVAL,'小明');
1166 insert into stua values(stuq.NEXTVAL,'小张');
1167 select * from stua
1168 drop SEQUENCE stuq
1169 --表格对数据进行判定，非法的改动拒绝
1170               五大约束
1171 主建 primary，外键 foreign，唯一 Unique，非空 not null，检验 check
1172 主键（灵魂）
1173 不能为空
1174 不能重复（唯一）
1175 --1简写
1176 create table stu2(
1177   sid number primary key ,
1178   sname varchar2(100)
1179 )
1180 --2（完整写法
1181 create table stu2(
1182   sid number,
1183   sname varchar2(100) not null  unique,--不为空，不重名
1184   constraint pk_sid primary key (sid)
1185 )
1186 成绩表主键
1187 create table mark2(
1188   sid number,
1189   cid number,
1190   cmark number,
1191   constraint pk_sid primary key (sid,cid)
1192 )
1193 --check = where 时间除外
1194 create table stu4(
1195   sid number primary key ,
1196   sname varchar2(100) not null ,
1197   ssex char(3) check ( ssex in ('男','女') )
1198   --amk number check (amk>=0 and amk<=100)     ,--均分
1199 
1200 )
1201 --外键，指向的是主键，比如marksid cid 是外建，
1202 
1203 select * from STUDENT
1204 drop table student;
1205 drop table mark;
1206 drop table COURSE;
1207 drop table TEACHER;
1208 create table student(
1209    sid int   ,
1210   sname varchar2(100) ,
1211   sage int not null ,
1212  ssex char(3) check ( ssex in ('男','女') ),
1213   snativeplace varchar2(100)  ,
1214   smajor varchar2(100) ,
1215   sclass varchar2(100) ,
1216   snative varchar2(100) ,
1217   brith varchar2(100) ,
1218     constraint pk_sid primary key (sid)
1219 
1220 )
1221 
1222 select * from student
1223 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10001,'廖官忠',21,'男','福建','信计','2班','汉族');
1224 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10002,'张三',20,'男','江苏','信计','2班','汉族');
1225 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10003,'李四',19,'男','福建','信计','2班','傣族');
1226 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10004,'萧瑾',21,'女','福建','统计','1班','汉族');
1227 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10005,'叶晶',21,'女','上海','传煤','1班','朝鲜族');
1228 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10006,'萧瑾',19,'女','北京','统计','2班','汉族');
1229 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10007,'李宁',21,'男','云南','信控','1班','傣族');
1230 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10008,'唐品',18,'男','江苏','信计','2班','汉族');
1231 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10009,'吴强',20,'男','山东','统计','1班','汉族');
1232 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10010,'欧阳锋',22,'男','四川','应数','1班','汉族');
1233 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10011,'王充样',23,'男','黑龙江','统计','2班','汉族');
1234 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10012,'卫小宝',17,'女','福建','统计','2班','汉族');
1235 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10013,'李绍',21,'女','福建','信计','2班','汉族');
1236 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10014,'黄马华',22,'男','浙江','心理学','1班','汉族');
1237 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10015,'艾蔚儿',19,'女','福建','计算机','1班','黎族');
1238 
1239 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10016,'赵若辰',21,'男','江苏','心理学','1班','汉族');
1240 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10017,'徐扬',22,'男','青海','计算机','1班','汉族');
1241 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10018,'徐静静',19,'女','安徽','计算机','1班','黎族');
1242 insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative,brith) values (10019,'徐静静',19,'女','安徽','计算机','1班','黎族',to_date('2018-2-9','yyy-mm-dd'));
1243 
1244 create table teacher (
1245   tid int,p
1246   tname varchar2(100),
1247  tsex char(3) check ( tsex in ('男','女') ),
1248   tage int,
1249   tlvl varchar2(100),
1250   constraint te_tid primary key (tid)
1251 )
1252 select * from teacher
1253 insert into teacher (tid,tname,tsex,tage,tlvl) values (30001,'马六','男',45,'高级教师');
1254 insert into teacher (tid,tname,tsex,tage,tlvl) values (30002,'胡美丽','女',32,'中级教师');
1255 insert into teacher (tid,tname,tsex,tage,tlvl) values (30003,'李强','男',40,'高级教师');
1256 insert into teacher (tid,tname,tsex,tage,tlvl) values (30004,'胡适','男',55,'教授');
1257 insert into teacher (tid,tname,tsex,tage,tlvl) values (30005,'钱枫','男',37,'高级教师');
1258 insert into teacher (tid,tname,tsex,tage,tlvl) values (30006,'戴安安','女',27,'中级教师');
1259 insert into teacher (tid,tname,tsex,tage,tlvl) values (30007,'张伯伦','男',47,'教授');
1260 
1261 create table mark(
1262   sid number,
1263   cid number,
1264   cmark number,
1265 constraint pk_sid_cid primary key (sid,cid),
1266 constraint fk_sid foreign key (sid) references student(sid),
1267 constraint fk_cid foreign key (cid) references student(cid)
1268 )
1269 insert into mark (sid,cid,cmark) values (10001,2001,85);
1270 insert into mark (sid,cid,cmark) values (10001,2002,75);
1271 insert into mark (sid,cid,cmark) values (10001,2003,80);
1272 insert into mark (sid,cid,cmark) values (10001,2004,70);
1273 insert into mark (sid,cid,cmark) values (10001,2005,60);
1274 insert into mark (sid,cid,cmark) values (10001,2006,95);
1275 insert into mark (sid,cid,cmark) values (10001,2007,70);
1276 insert into mark (sid,cid,cmark) values (10002,2001,80);
1277 insert into mark (sid,cid,cmark) values (10002,2002,65);
1278 insert into mark (sid,cid,cmark) values (10002,2003,70);
1279 insert into mark (sid,cid,cmark) values (10002,2004,80);
1280 insert into mark (sid,cid,cmark) values (10002,2005,55);
1281 insert into mark (sid,cid,cmark) values (10002,2006,78);
1282 insert into mark (sid,cid,cmark) values (10002,2007,82);
1283 insert into mark (sid,cid,cmark) values (10003,2001,69);
1284 insert into mark (sid,cid,cmark) values (10003,2002,57);
1285 insert into mark (sid,cid,cmark) values (10003,2003,90);
1286 insert into mark (sid,cid,cmark) values (10003,2004,80);
1287 insert into mark (sid,cid,cmark) values (10003,2005,77);
1288 insert into mark (sid,cid,cmark) values (10003,2006,92);
1289 insert into mark (sid,cid,cmark) values (10003,2007,80);
1290 insert into mark (sid,cid,cmark) values (10004,2001,85);
1291 insert into mark (sid,cid,cmark) values (10004,2002,76);
1292 insert into mark (sid,cid,cmark) values (10004,2003,66);
1293 insert into mark (sid,cid,cmark) values (10004,2004,54);
1294 insert into mark (sid,cid,cmark) values (10004,2005,80);
1295 insert into mark (sid,cid,cmark) values (10004,2006,73);
1296 insert into mark (sid,cid,cmark) values (10004,2007,80);
1297 insert into mark (sid,cid,cmark) values (10005,2001,93);
1298 insert into mark (sid,cid,cmark) values (10005,2002,82);
1299 insert into mark (sid,cid,cmark) values (10005,2003,71);
1300 insert into mark (sid,cid,cmark) values (10005,2004,68);
1301 insert into mark (sid,cid,cmark) values (10005,2005,70);
1302 insert into mark (sid,cid,cmark) values (10005,2006,86);
1303 insert into mark (sid,cid,cmark) values (10005,2007,90);
1304 insert into mark (sid,cid,cmark) values (10006,2001,69);
1305 insert into mark (sid,cid,cmark) values (10006,2002,48);
1306 insert into mark (sid,cid,cmark) values (10006,2003,90);
1307 insert into mark (sid,cid,cmark) values (10006,2004,68);
1308 insert into mark (sid,cid,cmark) values (10006,2005,80);
1309 insert into mark (sid,cid,cmark) values (10006,2006,88);
1310 insert into mark (sid,cid,cmark) values (10006,2007,70);
1311 insert into mark (sid,cid,cmark) values (10007,2001,77);
1312 insert into mark (sid,cid,cmark) values (10007,2002,75);
1313 insert into mark (sid,cid,cmark) values (10007,2003,82);
1314 insert into mark (sid,cid,cmark) values (10007,2004,67);
1315 insert into mark (sid,cid,cmark) values (10007,2005,84);
1316 insert into mark (sid,cid,cmark) values (10007,2006,95);
1317 insert into mark (sid,cid,cmark) values (10007,2007,73);
1318 insert into mark (sid,cid,cmark) values (10008,2001,97);
1319 insert into mark (sid,cid,cmark) values (10008,2002,86);
1320 insert into mark (sid,cid,cmark) values (10008,2003,68);
1321 insert into mark (sid,cid,cmark) values (10008,2004,81);
1322 insert into mark (sid,cid,cmark) values (10008,2005,71);
1323 insert into mark (sid,cid,cmark) values (10008,2006,78);
1324 insert into mark (sid,cid,cmark) values (10008,2007,64);
1325 insert into mark (sid,cid,cmark) values (10009,2001,90);
1326 insert into mark (sid,cid,cmark) values (10009,2002,75);
1327 insert into mark (sid,cid,cmark) values (10009,2003,60);
1328 insert into mark (sid,cid,cmark) values (10009,2004,57);
1329 insert into mark (sid,cid,cmark) values (10009,2005,90);
1330 insert into mark (sid,cid,cmark) values (10009,2006,85);
1331 insert into mark (sid,cid,cmark) values (10009,2007,91);
1332 insert into mark (sid,cid,cmark) values (10010,2001,85);
1333 insert into mark (sid,cid,cmark) values (10010,2002,62);
1334 insert into mark (sid,cid,cmark) values (10010,2003,72);
1335 insert into mark (sid,cid,cmark) values (10010,2004,81);
1336 insert into mark (sid,cid,cmark) values (10010,2005,91);
1337 insert into mark (sid,cid,cmark) values (10010,2006,90);
1338 insert into mark (sid,cid,cmark) values (10010,2007,66);
1339 insert into mark (sid,cid,cmark) values (10011,2001,55);
1340 insert into mark (sid,cid,cmark) values (10011,2002,75);
1341 insert into mark (sid,cid,cmark) values (10011,2003,67);
1342 insert into mark (sid,cid,cmark) values (10011,2004,87);
1343 insert into mark (sid,cid,cmark) values (10011,2005,88);
1344 insert into mark (sid,cid,cmark) values (10011,2006,77);
1345 insert into mark (sid,cid,cmark) values (10011,2007,61);
1346 insert into mark (sid,cid,cmark) values (10012,2001,77);
1347 insert into mark (sid,cid,cmark) values (10012,2002,81);
1348 insert into mark (sid,cid,cmark) values (10012,2003,91);
1349 insert into mark (sid,cid,cmark) values (10012,2004,67);
1350 insert into mark (sid,cid,cmark) values (10012,2005,60);
1351 insert into mark (sid,cid,cmark) values (10012,2006,80);
1352 insert into mark (sid,cid,cmark) values (10012,2007,74);
1353 insert into mark (sid,cid,cmark) values (10013,2001,88);
1354 insert into mark (sid,cid,cmark) values (10013,2002,75);
1355 insert into mark (sid,cid,cmark) values (10013,2003,90);
1356 insert into mark (sid,cid,cmark) values (10013,2004,60);
1357 insert into mark (sid,cid,cmark) values (10013,2005,71);
1358 insert into mark (sid,cid,cmark) values (10013,2006,95);
1359 insert into mark (sid,cid,cmark) values (10013,2007,89);
1360 insert into mark (sid,cid,cmark) values (10014,2001,65);
1361 insert into mark (sid,cid,cmark) values (10014,2002,72);
1362 insert into mark (sid,cid,cmark) values (10014,2003,68);
1363 insert into mark (sid,cid,cmark) values (10014,2004,67);
1364 insert into mark (sid,cid,cmark) values (10014,2005,60);
1365 insert into mark (sid,cid,cmark) values (10014,2006,75);
1366 insert into mark (sid,cid,cmark) values (10014,2007,81);
1367 insert into mark (sid,cid,cmark) values (10015,2001,55);
1368 insert into mark (sid,cid,cmark) values (10015,2002,67);
1369 insert into mark (sid,cid,cmark) values (10015,2003,61);
1370 insert into mark (sid,cid,cmark) values (10015,2004,71);
1371 insert into mark (sid,cid,cmark) values (10015,2005,81);
1372 insert into mark (sid,cid,cmark) values (10015,2006,88);
1373 insert into mark (sid,cid,cmark) values (10015,2007,90);
1374 insert into mark (sid,cid,cmark) values (10016,2001,72);
1375 insert into mark (sid,cid,cmark) values (10016,2002,82);
1376 insert into mark (sid,cid,cmark) values (10016,2003,92);
1377 insert into mark (sid,cid,cmark) values (10016,2004,62);
1378 insert into mark (sid,cid,cmark) values (10016,2005,63);
1379 insert into mark (sid,cid,cmark) values (10016,2006,73);
1380 insert into mark (sid,cid,cmark) values (10016,2007,83);
1381 insert into mark (sid,cid,cmark) values (10017,2001,85);
1382 insert into mark (sid,cid,cmark) values (10017,2002,77);
1383 insert into mark (sid,cid,cmark) values (10017,2003,87);
1384 insert into mark (sid,cid,cmark) values (10017,2004,79);
1385 insert into mark (sid,cid,cmark) values (10017,2005,69);
1386 insert into mark (sid,cid,cmark) values (10017,2006,58);
1387 insert into mark (sid,cid,cmark) values (10017,2007,74);
1388 insert into mark (sid,cid,cmark) values (10018,2001,88);
1389 insert into mark (sid,cid,cmark) values (10018,2002,78);
1390 insert into mark (sid,cid,cmark) values (10018,2003,88);
1391 insert into mark (sid,cid,cmark) values (10018,2004,78);
1392 insert into mark (sid,cid,cmark) values (10018,2005,68);
1393 insert into mark (sid,cid,cmark) values (10018,2006,98);
1394 insert into mark (sid,cid,cmark) values (10018,2007,78);
1395 
1396 create table course(
1397 cid number,
1398   cname varchar2(100),
1399   cval number,
1400   ctime number,
1401   tid number,
1402   constraint pk_cid primary key (cid),
1403   constraint  te_tid foreign key (tid) reference teacher(tid)
1404 );
1405 select * from course
1406 insert into course (cid,cname,cval,ctime,tid) values (2001,'数学',6,64,30001);
1407 insert into course (cid,cname,cval,ctime,tid) values (2002,'英语',4,64,30002);
1408 insert into course (cid,cname,cval,ctime,tid) values (2003,'体育',2,32,30003);
1409 insert into course (cid,cname,cval,ctime,tid) values (2004,'马克思主义',6,64,30004);
1410 insert into course (cid,cname,cval,ctime,tid) values (2005,'计算机基础',3,48,30005);
1411 insert into course (cid,cname,cval,ctime,tid) values (2006,'心理学',4,48,30006);
1412 insert into course (cid,cname,cval,ctime,tid) values (2007,'空间天气学',6,64,30007);
1413 insert into teacher (tid,tname,tsex,tage,tlvl) values (30001,'马六','男',45,'高级教师');
1414 insert into teacher (tid,tname,tsex,tage,tlvl) values (30002,'胡美丽','女',32,'中级教师');
1415 insert into teacher (tid,tname,tsex,tage,tlvl) values (30003,'李强','男',40,'高级教师');
1416 insert into teacher (tid,tname,tsex,tage,tlvl) values (30004,'胡适','男',55,'教授');
1417 insert into teacher (tid,tname,tsex,tage,tlvl) values (30005,'钱枫','男',37,'高级教师');
1418 insert into teacher (tid,tname,tsex,tage,tlvl) values (30006,'戴安安','女',27,'中级教师');
1419 insert into teacher (tid,tname,tsex,tage,tlvl) values (30007,'张伯伦','男',47,'教授');
1420 
1421 
1422 
1423 drop table writer;
1424 create table writer (
1425  wsid char(100),
1426  wname  char(50),
1427  wsex char(3),
1428  warea varchar2(100) ,
1429  wtelephone char(100) not null ,
1430  wid char(100) not null ,
1431  wtotal varchar2(100),
1432  wword varchar2 (100),
1433  wnote varchar2(100),
1434 
1435 constraint w_wsid primary key (wsid)
1436 
1437   );
1438 drop table wmony;
1439   --打赏表
1440 --mony
1441 create table wmony(
1442   wsid char(100),
1443   mbook char(100),
1444   mmony char(100),
1445     constraint e_wsid primary key (wsid)
1446   );
1447 
1448 
1449   --作者等级
1450 --grade
1451 drop table wgrade;
1452 create table wgrade (
1453 wsid char(100),
1454 ggrade char(100),
1455  constraint g_wsid primary key (wsid)
1456 );
1457 
1458 --排行榜
1459 --list
1460 drop table wqlist;
1461 create table wqlist (
1462   wsid char(100),
1463   wname char(100),
1464   lrank char(100),
1465   constraint l_wsid primary key (wsid)
1466 
1467 );
1468 
1469 insert into writer values ('001','唐三','男','徐州','18851923638','32038219565805456','107万','174万','18444');
1470 insert into writer values ('002','土豆','男','南京','18851923635','32038219582658048','105万','141万','1845');
1471 insert into writer values ('003','番茄','女','上海','18851923675','320382195826585586','104万','147万','184844');
1472 insert into writer values ('004','五一','女','南京','18851923634','320382195826587','488万','177万','18445');
1473 insert into writer values ('005','胡歌','男','长春','18851923678','32038219582658071','152万','152万','1875');
1474 insert into writer values ('006','西瓜','男','徐州','18851923688','3203821958265804452','1474万','14万','1844');
1475 insert into writer values ('007','独角','男','南京','18851023635','3203821958265450483','14万','151万','184');
1476 insert into writer values ('008','南瓜','女','西藏','18851927635','3203821958885584','17万','14万','1848');
1477 insert into writer values ('009','东瓜','女','香港','18851973634','320382198826580575','18万','147万','185');
1478 insert into writer values ('0010','北瓜','男','长春','18851923678','3203821957826580786','15万','14万','185');
1479 commit;
1480 
1481 
1482 
1483 insert into wmony values('001','斗破苍穹','100万');
1484 insert into wmony values('002','圣墟','125万');
1485 insert into wmony values('003','霸道总裁爱上我','245万');
1486 insert into wmony values('004','高冷男神','152万');
1487 insert into wmony values('005','我是流氓','1424万');
1488 insert into wmony values('006','三体','100万');
1489 insert into wmony values('007','明朝','125万');
1490 insert into wmony values('008','王子','245万');
1491 insert into wmony values('009','汉朝','152万');
1492 insert into wmony values('0010','981','1424万');
1493 commit;
1494 insert into wgrade values ('001','大神');
1495 insert into wgrade values ('002','大神');
1496 insert into wgrade values ('003','封圣');
1497 insert into wgrade values ('004','大神');
1498 insert into wgrade values ('005','小白');
1499 
1500 commit;
1501 insert into wqlist values('001','斗破苍穹','1');
1502 insert into wqlist values('002','圣墟','2');
1503 insert into wqlist values('003','霸道总裁爱上我','3');
1504 insert into wqlist values('004','高冷男神','4');
1505 insert into wqlist values('005','我是流氓','5');
1506 insert into wqlist values('006','斗破苍穹2','6');
1507 insert into wqlist values('007','明朝','7');
1508 insert into wqlist values('008','王子','8');
1509 insert into wqlist values('009','汉朝','9');
1510 insert into wqlist values('0010','981','10');
1511 
1512 commit;
1513 select * from writer;
1514 select * from wmony;
1515 select * from wgrade;
1516 select * from wqlist;
1517 
1518 
1519 
1520 索引
1521 1.什么时候会用到索引
1522 
1523 2.索引的作用
1524 节约时间，加快查询速度
1525 3.索引缺点
1526 占空间
1527 
1528 create index idx_sage on student (sage) --创建
1529   drop index  idx_sage --删除
1530 
1531 --视图 view
1532 超链接 指定数据
1533 知保存命令
1534 只有select是才执行
1535 在不违法规则的情况下，可以对数据进行修改
1536 
1537 create view myv_stu as
1538   select sid,sname from student where ssex='男'
1539 
1540 select * from myv_stu
1541 select * rowid.s,* from student s；
1542 
1543 
1544 create or replace view avgMark as
1545   select s.sid,sname ,avg(cmark) amk from student s left outer join mark m on s.sid=m.sid group by s.sid,sname;
1546 select * from avgMark
1547 
1548   select sid,avg(cmark) amk from mark group by sid  ;
1549 
1550 select sid
1551 from (select sid,avg(cmark) amk from mark group by sid) where amk=(select sid,avg(cmark) amk from mark group by sid  )
1552 ---删除
1553 truncate table student--永久性删除  DDL 不删除结构，删除数据
1554 delete from student where 1=1--在roolback中回到初始值
1555 
1556 
1557 
1558 数据库编程
1559 
1560 plsql结构
1561 【declare】可选项
1562 
1563   变量定义区
1564   begin
1565 代码区
1566   【exception】
1567 
1568   异常处理区
1569 end;
1570 
1571 
1572 --赋值    i  NUMBER:=100;
1573 DECLARE
1574   i  NUMBER:=100;
1575 
1576   BEGIN
1577   DBMS_OUTLN.PUT_LINE(i);
1578 
1579 
1580 
1581 end;
1582 --赋值
1583 DECLARE
1584   i  number:=10002;
1585   s  varchar2(100);
1586 
1587   BEGIN
1588     select sname into s from student
1589     where sid=i;
1590   DBMS_OUTput.PUT_LINE(s);
1591 
1592 
1593 
1594 end;
1595 
1596 DECLARE
1597   i  number:=10002;
1598   age number;
1599   s  varchar2(100);
1600 
1601   BEGIN
1602     select sname,sage into s,age from student
1603     where sid=i;
1604   DBMS_OUTput.PUT_LINE(s||';'||age);
1605 
1606 
1607 
1608 
1609 
1610 
1611 
1612 
1613 
1614 
1615 end;
1616 
1617 
1618 
1619 
1620 select sname
1621    from student s,(select sid,avg(cmark) from mark group by sid) m
1622    where s.sid=m.sid
1623 
1624 
1625 
1626 create view am as
1627 
1628 select  sname,amk from student s,(select sid,avg(cmark) amk from mark group by sid) m
1629 where s.sid=m.sid;
1630 
1631  select sid,avg(cmark) amk from mark group by sid m
1632 
1633 select * from am
1634 
1635 select sname, case
1636 when amk>=90 then '优秀'
1637            when amk>=80 then '良好'
1638            when amk>=60 then '一般'
1639 
1640            else '不及格'
1641            end
1642 from am;
1643 
1644 
1645 
1646 
1647 drop view am
1648 
1649 
1650 declare
1651   sno student.sid %type ;
1652   begin
1653   select sid from student where sname='&此人的学号为||sno'
1654   exception
1655   when too_many_rows then
1656   dbns_output.put_line('异常')
1657 
1658 end;
1659 
1660 declare
1661 snm student.snm %type ;
1662   cnt number;
1663 
1664   begin
1665   select sname into snm from student where sid='&此人为';
1666 update student set scmark=scmark+5
1667 where sid=(
1668 select sid from student where snativeplace='安徽'
1669     ) and (select avg(cmark) from mark where sid in (select sid from student where snativeplace='安徽') group by sid)<70
1670     and cname='数学'
1671 
1672 
1673   update student set scmark=scmark+2
1674 where sid=(
1675 select sid from student where snativeplace='北京'
1676     ) and (select avg(cmark) from mark where sid in (select sid from student where snativeplace='北京'))<75
1677 
1678 cnt:=sql%rowcount;
1679 
1680 dbms_output.put_line('更新'||cnt||'门')；
1681 exception
1682   when too_many_rows then
1683   dbms_output.put_line('异常');
1684   when no_data_found then
1685   dbms_output.put_line('qw异常');
1686  when others then
1687   dbms_output.put_line('qw异常');
1688   end;
1689 
1690 
1691 
1692 declare
1693  snm student.sname%type:='请输入姓名';sno student.sid%type;
1694 amk mark.cmark%type;
1695   score mark.cmark%type;snt student.snativeplace%type;
1696   cnt number;
1697   cno course.cid%type;
1698   begin
1699   --取出所有数据，保存变量中
1700   select sid,snativeplace into sno,snt
1701     from student where sname=snm;
1702     select avg(cmark) into  amk from mark where sid=sno;
1703           select cid into cno from course where cname='数学';
1704 
1705     select cmark into score from mark where cid=cno and sid=sno;
1706 
1707   --条件判断
1708   if snt='安徽' and amk<70
1709 then
1710   score:=score+5;
1711     elsif
1712     snt='北京' and amk<75
1713     then
1714      update mark set cmark=cmark+2
1715 
1716 
1717     cnt:=sql%rowcount;
1718     dbms_output.put_line('更新'||cnt||'门')
1719   end if;
1720   --在条件骨架插入
1721   exception
1722   when too_many_rows then
1723   dbms_output.put_line('重复名字');
1724   when no_data_found then
1725   dbms_output.put_line('名字为口');
1726  when others then
1727   dbms_output.put_line('未知异常');
1728   --异常
1729 
1730 end;
1731 
1732 
1733 --第二题：
1734 --扫描每个学生：
1735 --如果这个学生来自壮族或者苗族，那么其各科成绩+3分，
1736 --且不进行后续判断
1737 --如果这个学生来自安徽，且均分低于70
1738 --那么将其数学成绩+5分
1739 --如果这个学生来自北京，且均分低于75分，那么将其各课
1740 --成绩低于70分的课程成绩+2分，并打印共更新了几门课。
1741 --当各学生成绩更新完毕后打印这个学生的各科成绩
1742 --要求显示  XXX的数学成绩是。。。分，成绩优秀
1743     --      XXX的英语成绩是。。。分，成绩良好-
1744 
1745     select * from student;
1746 declare
1747 snm student.sname%type;sno student.sid%type;
1748 amk mark.cmark%type;
1749   score mark.cmark%type;snt student.snativeplace%type;
1750   cnt number;
1751   cno course.cid%type;
1752 sna student.snative%type;
1753 line student%rowtype;
1754   line2 course%rowtype;
1755    cnm course.cname%type;
1756    cM  course.cid%type;
1757  begin
1758   for line in (select * from student) loop
1759   select sid into sno
1760   from student
1761   where sid = line.sid;
1762 select sname into snm
1763   from student
1764   where sid = line.sid;
1765   select snativeplace into snt
1766   from student
1767   where sid = sno;
1768 select snative into sna
1769   from student
1770   where sid = sno;
1771 
1772   select avg(cmark) into amk
1773   from mark
1774   where sid = line.sid;
1775 
1776 select cid into cno from course where cname='数学';
1777 
1778 select cmark into score from mark where sid=sno and cid=cno;
1779  if sna='壮族' or sna='苗族'
1780  then
1781    update mark set cmark=cmark+3
1782    where sid=sno;
1783    elsif
1784    snt='安徽' and amk<70
1785 then
1786 update mark set cmark=cmark+5
1787    where cid=score and sid=sno;
1788     elsif
1789     snt='北京' and amk<75
1790     then
1791      update mark set cmark=cmark+2
1792 where sid = sno and cmark<70;
1793 
1794     cnt:=sql%rowcount;
1795     dbms_output.put_line('更新'||cnt||'门')
1796 end if;
1797 for line2 in (select * from course) loop
1798   select cid into cno
1799   from course
1800     where cid = line2.cid;
1801     select cname into cnm
1802   from course
1803     where cid = line2.cid;
1804     select cname into cnm
1805   from course
1806     where cid = cno;
1807     select cmark into cmk
1808   from mark
1809     where cid = cno and sid =sno;
1810     if cmk > 90
1811         then
1812           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩优秀');
1813       elsif cmk > 80
1814         then
1815           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩良好');
1816       elsif cmk > 60
1817         then
1818           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩一般');
1819       else
1820           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',不及格');
1821       end if;
1822 
1823 end loop;
1824   end loop;
1825 
1826   exception
1827   when too_many_rows then
1828   dbms_output.put_line('重复名字');
1829   when no_data_found then
1830   dbms_output.put_line('名字为空');
1831  when others then
1832   dbms_output.put_line('未知异常');
1833 end;
1834 
1835 
1836 
1837 
1838 declare
1839   line student%rowtype;
1840   snm student.sname%type;
1841   snv student.snative%type;
1842   snp student.snativeplace%type;
1843   sno student.sid%type;
1844   amk mark.cmark%type;
1845   cM  course.cid%type;
1846   line2 course%rowtype;
1847   cnm course.cname%type;
1848   cno course.cid%type;
1849   cmk mark.cmark%type;
1850   cnt number;
1851 
1852 begin
1853   for line in (select * from student) loop
1854   select sid into sno
1855   from  student
1856   where sid = line.sid;
1857   select sname into snm
1858   from student
1859   where sid = sno;
1860   select snativeplace into snp
1861   from student
1862   where sid = sno;
1863   select snative into snv
1864   from student
1865   where sid = sno;
1866   select avg(cmark) into amk
1867   from mark
1868   where sid = sno;
1869   select cid into cM
1870   from course
1871   where cname = '数学';
1872 -----------------------------------------
1873 
1874   if snv = '壮族' or snv = '苗族'
1875     then
1876       update mark set cmark = cmark + 3
1877       where sid = sno;
1878   elsif snp = '安徽' and amk < 70
1879   then
1880     update mark set cmark = cmark + 5
1881     where cid = cM and sid = sno;
1882   elsif snp = '北京' and amk < 75
1883   then
1884     update mark set cmark = cmark + 2
1885     where sid = sno and cmark < 70;
1886     cnt := SQL%rowcount;
1887     DBMS_OUTPUT.put_line('共更新了'||cnt||'门课');
1888   end if;
1889       for line2 in (select * from course) loop
1890       select cid into cno
1891       from course
1892       where cid = line2.cid;
1893       select cname into cnm
1894       from course
1895       where cid = cno;
1896       select cmark into cmk
1897       from mark
1898       where cid = cno and sid = sno;
1899       if cmk > 90
1900         then
1901           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩优秀');
1902       elsif cmk > 80
1903         then
1904           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩良好');
1905       elsif cmk > 60
1906         then
1907           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',成绩一般');
1908       else
1909           DBMS_OUTPUT.put_line(snm||'的'||cnm||'是'||cmk||',不及格');
1910       end if;
1911     end loop;
1912   end loop;
1913 end;
1914 S
1915 --第二题：
1916 --扫描每个学生：
1917 --如果这个学生来自壮族或者苗族，那么其各科成绩+3分，
1918 --且不进行后续判断
1919 --如果这个学生来自安徽，且均分低于70
1920 --那么将其数学成绩+5分
1921 --如果这个学生来自北京，且均分低于75分，那么将其各课
1922 --成绩低于70分的课程成绩+2分，并打印共更新了几门课。
1923 --当各学生成绩更新完毕后打印这个学生的各科成绩
1924 --要求显示  XXX的数学成绩是。。。分，成绩优秀
1925     --      XXX的英语成绩是。。。分，成绩良好-
1926   select * from course
1927       select * from student
1928 
1929 declare
1930   line student%rowtype;
1931   line2 course%rowtype;
1932   snm student.sname%type;
1933   sna student.snative%type;
1934 snt student.snativeplace%type;
1935 sno student.sid%type;
1936   cmk mark.cmark%type;
1937 amk mark.cmark%type;
1938 cno course.cid%type;
1939 cna course.cname%type;
1940   cm course.cid%type;
1941 
1942 
1943 
1944   begin
1945 
1946 end;
1947 
1948 
1949 
1950 
1951 select CID,cmark from MARK where SID=(select SID from STUDENT where SNAME='张三')
1952 and CMARK=(select MAX(CMARK) from MARK m where SID=(select SID from STUDENT where SNAME='张三'));
1953 --编写存储过程，modMK，要求输入学号，课程号，成绩
1954 --如果学号不存在，课程号在成绩表中不存在，抛出异常
1955 --如果sid和cid指定的记录不存在测向mark插入新的记录
1956 --sid和cid在这条记录修改为新的marmark已经存在则如果
1957 --如果输入的成绩参数小于0，和大于100，异常
1958  create or replace  procedure qa(
1959  sno in student.sid%type,
1960 cna course.cid%type,
1961 cm mark.cmark%type
1962 )
1963 as
1964 
1965   nsno student.sid%type;
1966   ncna course.cid%type,
1967 ncm mark.cmark%type
1968 
1969   begin
1970    when cm<0 and cm>100
1971      then
1972   dbms_output.put_line('输入值不正确');
1973   when sid!=sno then
1974   dbms_output.put_line('学号不存在');
1975    when cid!=cno then
1976   dbms_output.put_line('课程号不存在');
1977 
1978     select cid into ncno from course where cid=cna;
1979     select sid into nsno from student where sid=sno;
1980     select cmark into ncm from mark where sid=sno and cid=cna;
1981     select * from student s,mark m,course c where s.sid=m.sid and c.cid=m.cid  m;
1982      if sid!=sno or cid!=cna
1983        then
1984        insert into m values (sno,cna,cm);
1985      end if;
1986      end;
1987 
1988 
1989 select * from mark
1990 exception
1991   when too_many_rows then
1992   dbms_output.put_line('重复名字');
1993   when no_data_found then
1994   dbms_output.put_line('名字为空');
1995  when others then
1996   dbms_output.put_line('未知异常');
1997 
1998 
1999 
2000 drop procedure qa
2001  create or replace  procedure qa(
2002  sno in student.sid%type,
2003 cna in course.cid%type,
2004 cm  in mark.cmark%type
2005 )
2006 as
2007 
2008   nsno student.sid%type;
2009   ncna course.cid%type;
2010 ncm mark.cmark%type;
2011 numerro exception;
2012   begin
2013    if cm<0 or cm>100
2014      then
2015        raise numerro;
2016        end if;
2017 
2018     select cid into ncna from course where cid=cna;
2019     select sid into nsno from student where sid=sno;
2020     select cmark into ncm from mark where sid=sno and cid=cna;
2021 
2022 
2023      if sno!=nsno and cm !=ncm
2024        then
2025          insert into mark(sid,cid,cmark)values(sno,cna,cm);
2026          elsif
2027          sno = nsno and cm=ncm
2028          then
2029            update mark set cmark=cm
2030            where sid=sno and cid=cna;
2031            end if;
2032 
2033 exception
2034   when NO_DATA_FOUND THEN
2035     DBMS_OUTPUT.put_line('此用户不存在');
2036   when OTHERS THEN
2037     DBMS_OUTPUT.put_line('其他未知异常');
2038 
2039 
2040 end;
2041    begin
2042      qa(10001,2001,45)
2043    end;
2044 
2045   create table stubak
2046   as select * from student where 1=2
2047   select * from stubak
2048   create or replace trigger stug
2049   before delete on student--删除
2050   begin
2051   insert into stubak values(
2052   :old.sid,:old.sname,:old.sage,:old.ssex,
2053   :old.snativeplace,
2054   :old.smajor,
2055   :old.sclass,
2056   :old.sname
2057   ) ;
2058  end;
2059 
2060 
2061 
2062 
2063  create or replace trigger jf
2064   after update on student
2065   for each row
2066    as
2067   snm student.sname%type;
2068   sno student.sid%type:='&请输入学生学号';
2069   amk mark.cmark%type;
2070 
2071 
2072 
2073   begin
2074   select sname into snm from student where sid =sno;
2075 select avg(cmark) into amk from mark where sid=sno;
2076 dbms_output.put_line(snm||'的均分是'||amk);
2077 if amk>80
2078   then
2079   update student set
2080     sclass='1班' ;
2081    else
2082   sclass='2班';
2083 
2084 
2085 end if;
2086 end;
2087 
2088 
2089 
2090 
2091 -- 从账户一向账户二转账DECLARE
2092   v_money NUMBER(8, 2); -- 转账金额
2093   v_balance account.balance%TYPE; -- 账户余额
2094 BEGIN
2095   v_money := &转账金额; -- 输入转账金额
2096   -- 从账户一减钱
2097   UPDATE account SET balance = balance - v_money WHERE id=&转出账户
2098   RETURNING balance INTO v_balance;
2099   IF SQL%NOTFOUND THEN
2100     RAISE_APPLICATION_ERROR(-20001, '没有该账户：'||&转出账户);
2101   END IF;
2102   IF v_balance < 0 THEN
2103     RAISE_APPLICATION_ERROR(-20002, '账户余额不足');
2104   END IF;
2105 
2106   -- 向账户二加钱
2107   UPDATE account SET balance = balance + v_money WHERE id=&转入账户;
2108   IF SQL%NOTFOUND THEN
2109     RAISE_APPLICATION_ERROR(-20001, '没有该账户：'||&转入账户);
2110   END IF;
2111 
2112   -- 如果没有异常，则提交事务
2113   COMMIT;
2114   DBMS_OUTPUT.PUT_LINE('转账成功');
2115 
2116   EXCEPTION
2117     WHEN OTHERS THEN
2118       ROLLBACK; -- 出现异常则回滚事务
2119       DBMS_OUTPUT.PUT_LINE('转账失败：');
2120       DBMS_OUTPUT.PUT_LINE(SQLERRM);END;
2121 
2122 
2123 
2124 ---
2125 
2126 Oracle 用户管理权限
2127 
2128 
2129 CRESTE PROFILE LIM
2130 failed_login_attempts 3;
2131 
2132 
2133 ldentified
2134 
2135 select s.sid,avg(),from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid  group by s.sid,m.cid;
2136 select avg() from (select * from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid )
2137 
2138 
2139 select sid,avg(cmark) from (
2140                            select * from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid s)
2141 group by sid
2142 select sid,avg(cmark)  from STUDENT,mark,COURSE where STUDENT.sid=mark.sid and mark.cid=COURSE.cid
2143 group by sid---各个地区数学均分
2144 
2145 
2146 create view avg_w as
2147   select s.sid,s.sname,avg(cmark) from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid group by s.sid , c.sid;
2148 
2149 
2150 delimiter//
2151   create procedure add_pro
2152   (a int,b int,out max int,out min int)
2153   begin
2154     set min = (select s.sid,min(cmark) from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid group by s.sid);
2155      set max= (select s.sid,max(cmark) from student s,mark m,course c where s.sid=m.sid and m.cid= c.cid group by s.sid);
2156 
2157 
2158 select max(cmark) from mark
2159 
2160 select * from avgMark
2161 
2162 
2163 
2164 
2165 delimiter//
2166   create procedure add_pro
2167   (a String,out max int,out min int)
2168   begin
2169     max=select s.sid,max(cmark)
2170     from student s,mark m,course c
2171     where s.sid=m.sid and m.cid= c.cid and s.sname = a group by s.sid;
2172 
2173 min=select s.sid,min(cmark)
2174     from student s,mark m,course c
2175     where s.sid=m.sid and m.cid= c.cid and s.sname = a group by s.sid;
2176     end;
2177 
2178 
2179 
2180 
2181 
2182 
2183 
2184 
2185 
2186 
2187 
2188 
2189 select s.sid,max(cmark)
2190     from student s,mark m,course c
2191     where s.sid=m.sid and m.cid= c.cid group by s.sid;
2192 

转载于:https://www.cnblogs.com/czg-0705/p/11396241.html