Oracle 数据SQL脚本学习
----- 建表语句
create table student(
sno varchar2(10) primary key,
sname varchar2(20),
sage number(2),
ssex varchar2(5)
);
create table teacher(
tno varchar2(10) primary key,
tname varchar2(20)
);
create table course(
cno varchar2(10),
cname varchar2(20),
tno varchar2(20),
constraint pk_course primary key (cno,tno)
);
create table sc(
sno varchar2(10),
cno varchar2(10),
score number(4,2),
constraint pk_sc primary key (sno,cno)
);
/*******初始化学生表的数据******/
insert into student values ('s001','张三',23,'男');
insert into student values ('s002','李四',23,'男');
insert into student values ('s003','吴鹏',25,'男');
insert into student values ('s004','琴沁',20,'女');
insert into student values ('s005','王丽',20,'女');
insert into student values ('s006','李波',21,'男');
insert into student values ('s007','刘玉',21,'男');
insert into student values ('s008','萧蓉',21,'女');
insert into student values ('s009','陈萧晓',23,'女');
insert into student values ('s010','陈美',22,'女');
commit;
/******************初始化教师表***********************/
insert into teacher values ('t001', '刘阳');
insert into teacher values ('t002', '谌燕');
insert into teacher values ('t003', '胡明星');
commit;
/***************初始化课程表****************************/
insert into course values ('c001','J2SE','t002');
insert into course values ('c002','Java Web','t002');
insert into course values ('c003','SSH','t001');
insert into course values ('c004','Oracle','t001');
insert into course values ('c005','SQL SERVER 2005','t003');
insert into course values ('c006','C#','t003');
insert into course values ('c007','JavaScript','t002');
insert into course values ('c008','DIV+CSS','t001');
insert into course values ('c009','PHP','t003');
insert into course values ('c010','EJB3.0','t002');
commit;
/***************初始化成绩表***********************/
insert into sc values ('s001','c001',78.9);
insert into sc values ('s002','c001',80.9);
insert into sc values ('s003','c001',81.9);
insert into sc values ('s004','c001',60.9);
insert into sc values ('s001','c002',82.9);
insert into sc values ('s002','c002',72.9);
insert into sc values ('s003','c002',81.9);
insert into sc values ('s001','c003','59');
commit;
------------测试SQL语句
----1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；
select a.* from
(select * from sc a where a.cno='c001') a ,
(select * from sc a where a.cno='c002') b
where a.sno = b.sno and a.score > b.score;
select * from sc a where a.cno = 'c001'
and exists (select * from sc b
where b.cno = 'c002'
and a.score > b.score
and a.sno = b.sno)
----2、查询平均成绩大于70 分的同学的学号和平均成绩；
select sno , avg(score) ag from sc group by sno having avg(score)>70;
select * from (
select sno , avg(score) ag from sc group by sno
) where ag >70;
----3、查询所有同学的学号、姓名、选课数、总成绩；
select a.*,
s.sname from (select sno, count(cno), sum(score) from sc group by sno) a,
student s where a.sno = s.sno;
select a.*, s.sname from student s join
(select sno, count(cno), sum(score) from sc group by sno) a
on a.sno = s.sno ;
----4、查询姓“刘”的老师的个数；
select count(*) from teacher t where tname like '刘%'
----5、查询没学过“谌燕”老师课的同学的学号、姓名；
select a.sno, a.sname from student a where a.sno not in
(
select distinct s.sno from sc s,
(select c.* from course c ,
(select tno from teacher where tname='谌燕') t
where c.tno = t.tno) b
where s.cno = b.cno
);
select * from student st where st.sno not in(
select distinct s.sno from sc s
join course c on s.cno = c.cno
join teacher t on t.tno = c.tno
where tname='谌燕' );
----6、查询学过“c001”并且也学过编号“c002”课程的同学的学号、姓名；
select s.* from sc a
join sc b on a.sno = b.sno
join student s on s.sno = a.sno
where a.cno = 'c001'
and b.cno = 'c002'
and s.sno = a.sno;
select s.* from student s join
(
select a.* from sc a join sc b on a.sno = b.sno
where a.cno = 'c001' and b.cno = 'c002'
) tt on s.sno = tt.sno
----7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；
select s.*, c.cno from student s
join sc a on s.sno = a.sno
join course c on c.cno = a.cno
join teacher t on t.tno = c.tno
where tname='谌燕';
----8、查询课程编号“c002”的成绩比课程编号“c001”课程低的所有同学的学号、姓名；
select s.*, a.*, b.* from student s
join sc a on s.sno = a.sno
join sc b on s.sno = b.sno
where a.score > b.score and a.cno = 'c001' and b.cno = 'c002';
select * from student s
join sc a on s.sno = a.sno
join sc b on s.sno = b.sno
where a.score > b.score and a.cno = 'c001' and b.cno = 'c002';
----9、查询所有课程成绩小于60 分的同学的学号、姓名；
select * from student s
join sc a on s.sno = a.sno
join course c on c.cno = a.cno
where a.score < 60 ;
----10、查询没有学全所有课的同学的学号、姓名；
select s.sno, s.sname, count(a.cno) from student s
left join sc a on s.sno = a.sno
group by s.sno, s.sname
having count(a.cno)<
(select count (distinct cno ) from course) ;
----11、查询至少有一门课与学号为“s001”的同学所学相同的同学的学号和姓名；
select st.* from student st,
(select distinct a.sno from
(select * from sc) a,
(select * from sc where sc.sno='s001') b
where a.cno = b.cno)h
where st.sno = h.sno and st.sno <>'s001'
----12、查询至少学过学号为“s001”同学所学课的其他同学学号和姓名、所学课；
select * from sc
left join student st on st.sno = sc.sno
where sc.sno <> 's001'
and sc.cno in (select cno from sc where sno = 's001')
----13、把“SC”表中“谌燕”老师教的课的成绩都更改为此课程的平均成绩；
---- 13.1 查询谌燕所授每门课的平均成绩
select avg(a.score), c.cname from course c
join teacher tt on tt.tno = c.tno
join sc a on a.cno = c.cno
where tt.tname='谌燕'
group by c.cno ,c.cname;
---- 13.2 查询谌燕所授全部课
select cno from course a,teacher b
where a.tno=b.tno and b.tname='谌燕'
---- 13.3 更改谌燕所授全部课的平均成绩
update sc c set score = (select avg(c.score)
from course a, teacher b
where a.tno = b.tno
and b.tname = '谌燕'
and a.cno = c.cno
group by c.cno)
where cno in (select cno
from course a, teacher b
where a.tno = b.tno
and b.tname = '谌燕')
----14、查询和“s001”号的同学学习的课程完全相同的其他同学学号和姓名；
select * from sc where sno<>'s001'
minus
(
select * from sc
minus
select * from sc where sno='s001'
)
----15、删除学习“谌燕”老师课的SC 表记录；
delete from sc where sc.cno in(
select cno from course a, teacher b
where a.tno = b.tno
and b.tname = '谌燕'
);
delete from sc where sc.cno in(
select cno from course c
left join teacher tt on c.tno = tt.tno
where tt.tname='谌燕'
);
----16、向SC 表中插入一些记录，这些记录要求符合以下条件：没有上过编号“c002”课程的同学学号、“c002”号课的平均成绩；
insert into sc (sno, cno, score)
select distinct st.sno,
sc.cno,
(select avg(score) from sc where cno = 'c002')
from student st, sc
where not exists (select *
from sc
where cno = 'c002'
and sc.sno = st.sno)
and sc.cno = 'c002';
----17、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分
select cno, max(score), min(score) from sc group by cno;
----18、按各科平均成绩从低到高和及格率的百分数从高到低顺序
select cno,
avg(score),
sum(case
when score > 60 then
1
else
0
end) / count(*) as 及格率
from sc
group by cno
order by avg(score), 及格率 desc ;
----19、查询不同老师所教不同课程平均分从高到低显示
select max(t.tno),
max(t.tname),
max(c.cno),
max(c.cname),
c.cno,
avg(score)
from sc, course c, teacher t
where sc.cno = c.cno
and c.tno = t.tno
group by c.cno
order by avg(score) desc ;
----20、统计打印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]
select c.cno, c.cname ,
sum(case when s.score between 85 and 100 then 1 else 0 end) as "[100-85]",
sum(case when s.score between 70 and 85 then 1 else 0 end) as "[85-70]",
sum(case when s.score between 60 and 70 then 1 else 0 end) as "[70-60]",
sum(case when s.score < 60 then 1 else 0 end) as "[<60]"
from sc s, course c where s.cno = c.cno group by c.cno, c.cname ;
----21、查询各科成绩前三名的记录:(不考虑成绩并列情况)
select * from (select sno, cno, score,
row_number() over(partition by cno order by score desc) rn
from sc)
where rn < 4
----22、查询每门课程被选修的学生数
select count(*), cno from sc group by cno;
----23、查询出只选修了一门课程的全部学生的学号和姓名
select s.sno, s.sname, count(cno) from student s
left join sc a on s.sno = a.sno
group by s.sno, s.sname having count(cno) = 1;
----24、查询男生、女生人数
---- 1
select count(*), ssex from student where ssex='男'group by ssex
union
select count(*), ssex from student where ssex='女'group by ssex;
---- 2
select count(*), ssex from student group by ssex;
----25、查询姓“张”的学生名单
select * from student where sname like '张%';
----26、查询同名同姓学生名单，并统计同名人数
select sname, count(*) from student group by sname having count(*)>1;
----27、1981 年出生的学生名单(注：Student 表中Sage 列的类型是number)
select sno,sname,sage,ssex from student t where to_char(sysdate,'yyyy')-sage =1981
----28、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列
select avg(a.score) ag, a.cno from sc a group by a.cno order by ag asc , a.cno desc;
----29、查询平均成绩大于70的所有学生的学号、姓名和平均成绩
select s.sno, s.sname, avg(a.score) from student s
left join sc a on s.sno = a.sno group by s.sno, s.sname
having avg(a.score) > 70;
----30、查询课程名称为“数据库”，且分数低于60 的学生姓名和分数
select s.sname, a.score from student s
join sc a on a.sno = s.sno
join course c on c.cno = a.cno
where c.cname = 'Oracle' and a.score < 60;
select sname, score
from student st, sc, course c
where st.sno = sc.sno
and sc.cno = c.cno
and c.cname = 'Oracle'
and sc.score < 60
----31、查询所有学生的选课情况；
----1
select s.sno, s.sname, a.cno, c.cname
from student s , sc a, course c
where s.sno = a.sno and a.cno = c.cno ;
----2
select s.sno, s.sname, a.cno, c.cname from student s
left join sc a on a.sno = s.sno
left join course c on a.cno = c.cno;
----3
select s.sno, s.sname, a.cno,
nvl(c.cname,'未选课') as name
from student s
left join sc a on a.sno = s.sno
left join course c on a.cno = c.cno;
----32、查询任何一门课程成绩在70 分以上的姓名、课程名称和分数；
select * from student s, sc a, course c
where s.sno = a.sno and a.cno = c.cno and a.score>70
----33、查询不及格的课程，并按课程号从大到小排列
select * from sc where score < 60 order by score desc;
select sc.sno, c.cname, sc.score from sc, course c
where sc.cno = c.cno
and sc.score < 60
order by sc.cno desc;
----34、查询课程编号为c001 且课程成绩在80 分以上的学生的学号和姓名；
select * from student s
join sc a on s.sno = a.sno
where a.score > 80 and a.cno = 'c001';
----35、求选了课程的学生人数
select count(distinct sno) from sc;
----36、查询选修“谌燕”老师所授课程的学生中，成绩最高的学生姓名及其成绩
select * from student s, sc , course c, teacher t
where s.sno = sc.sno and sc.cno = c.cno and c.tno = t.tno
and t.tname='谌燕' and sc.score = (
select max(score) from sc where sc.cno=c.cno);
----37、查询各个课程及相应的选修人数
select cno,count(sno) from sc group by cno;
----38、查询不同课程成绩相同的学生的学号、课程号、学生成绩
select a.* from sc a ,sc b where a.score=b.score and a.cno<>b.cno
----39、查询每门功课成绩最好的前两名
select * from (
select sno,cno,score, row_number() over (partition by cno order by score desc) my_rn from sc t
) where my_rn<=2
----40、统计每门课程的学生选修人数（超过10 人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列
select cno, count(sno) from sc
group by cno
having count(sno) > 10
order by count(sno) desc, cno asc;
----41、检索至少选修两门课程的学生学号
select sno from sc group by sno having count(cno)>1;
select sno from sc group by sno having count(sno)>1;
----42、查询全部学生都选修的课程的课程号和课程名
select distinct(c.cno),c.cname from course c ,sc where sc.cno=c.cno;
select cno,cname from course c
where c.cno in (select cno from sc group by cno);
----43、查询没学过“谌燕”老师讲授的任一门课程的学生姓名
select st.sname
from student st
where st.sno not in (select distinct sc.sno
from sc, course c, teacher t
where sc.cno = c.cno
and c.tno = t.tno
and t.tname = '谌燕');
----44、查询两门以上不及格课程的同学的学号及其平均成绩
select sno,avg(score)from sc
where sno in (
select sno from sc where sc.score < 60 group by sno having count(sno)>1
) group by sno ;
----45、检索“c004”课程分数小于60，按分数降序排列的同学学号
select sno from sc where cno='c004' and score<90 order by score desc;