1.有如下表记录:
ID Name EmailAddress LastLogon
100 test4
[email protected] 2007-11-25 16:31:26
13 test1
[email protected] 2007-3-22 16:27:07
19 test1
[email protected] 2007-10-25 14:13:46
42 test1
[email protected] 2007-11-20 14:20:10
45 test2
[email protected] 2007-4-25 14:17:39
49 test2
[email protected] 2007-5-25 14:22:36
用一句sql查询出每个用户最近一次登录的记录(每个用户只显示一条最近登录的记录)
方法一:
SELECT a.* from users a inner join
(SELECT [Name], LastLogon=MAX(LastLogon) FROM users GROUP BY [Name]) b
on a.[Name]=b.[Name] and a.[LastLogon]=b.[LastLogon]
方法二:
SELECT a.* from users a inner join
(SELECT Name,MAX(LogonID) LogonID FROM users GROUP BY [Name]) b
on a.LogonID=b.LogonID
--where a.LogonId=b.LogonId
2. 题目是这样的:有一个数据库表peope,表有字段name,age,address三个属性(注:没有主键)。现在如果表中有重复的数据,请删去重复只留下其中的一条。重复的定义就是两条记录的name,age,address值都一样。
CREATE TEMPORARY TABLE tmp_table select * from people group by name,age,address having COUNT(DISTINCT name)=1
delete from people
insert into people select * from tmp_table
3. SQL顺序列找出断号
select id from info
id
-----------
1
2
3
5
6
7
8
10
11
12
15
(11 行受影响)
方法一:
select (select max(id)+1 from Info where id<a.id) as beginId,(id-1) as endId
from Info a
where
a.id>(select max(id)+1 from Info where id<a.id)
beginId endId
----------- -----------
4 4
9 9
13 14
(3 行受影响)
方法二:
select beginId,(select min(id)-1 from info where id > beginId) as endId
from (
select id+1 as beginId from info where id+1 not in (select id from info) and id < (select max(id) from info)
) as t
beginId endId
----------- -----------
4 4
9 9
13 14
(3 行受影响)
说明:
1、查找结果的两列是断号的区间,如果beginId=endId,则表示缺少该号码,否则表示缺少beginId ~ endId;
2、如果号码1不存在,区间1 ~ select min(id)-1 from info 将无法找出
不错的sql面试题
http://topic.csdn.net/u/20081020/15/1abf54d0-f401-42ab-a75e-df90027ceba0.html
Student(S#,Sname,Sage,Ssex) 学生表
Course(C#,Cname,T#) 课程表
SC(S#,C#,score) 成绩表
Teacher(T#,Tname) 教师表
问题:
1、查询“001”课程比“002”课程成绩高的所有学生的学号;
select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
from SC where C#='002') b
where a.score>b.score and a.s#=b.s#;
2、查询平均成绩大于60分的同学的学号和平均成绩;
select S#,avg(score)
from sc
group by S# having avg(score) >60;
3、查询所有同学的学号、姓名、选课数、总成绩;
select Student.S#,Student.Sname,count(SC.C#),sum(score)
from Student left Outer join SC on Student.S#=SC.S#
group by Student.S#,Sname
4、查询姓“李”的老师的个数;
select count(distinct(Tname))
from Teacher
where Tname like '李%';
5、查询没学过“叶平”老师课的同学的学号、姓名;
select Student.S#,Student.Sname
from Student
where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平');
6、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名;
select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#='001'and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#='002');
7、查询学过“叶平”老师所教的所有课的同学的学号、姓名;
select S#,Sname
from Student
where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname='叶平'));
8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名;
Select S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2
from Student,SC where Student.S#=SC.S# and C#='001') S_2 where score2 <score;
9、查询所有课程成绩小于60分的同学的学号、姓名;
select S#,Sname
from Student
where S# not in (select Student.S# from Student,SC where S.S#=SC.S# and score>60);
10、查询没有学全所有课的同学的学号、姓名;
select Student.S#,Student.Sname
from Student,SC
where Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) <(select count(C#) from Course);
11、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名;
select S#,Sname from Student,SC where Student.S#=SC.S# and C# in select C# from SC where S#='1001';
12、查询至少学过学号为“001”同学所有一门课的其他同学学号和姓名;
select distinct SC.S#,Sname
from Student,SC
where Student.S#=SC.S# and C# in (select C# from SC where S#='001');
13、把“SC”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩;
update SC set score=(select avg(SC_2.score)
from SC SC_2
where SC_2.C#=SC.C# ) from Course,Teacher where Course.C#=SC.C# and Course.T#=Teacher.T# and Teacher.Tname='叶平');
14、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名;
select S# from SC where C# in (select C# from SC where S#='1002')
group by S# having count(*)=(select count(*) from SC where S#='1002');
15、删除学习“叶平”老师课的SC表记录;
Delect SC
from course ,Teacher
where Course.C#=SC.C# and Course.T#= Teacher.T# and Tname='叶平';
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“003”课程的同学学号、2、
号课的平均成绩;
Insert SC select S#,'002',(Select avg(score)
from SC where C#='002') from Student where S# not in (Select S# from SC where C#='002');
17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩,按如下形式显示: 学生ID,,数据库,企业管理,英语,有效课程数,有效平均分
SELECT S# as 学生ID
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 数据库
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企业管理
,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英语
,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩
FROM SC AS t
GROUP BY S#
ORDER BY avg(t.score)
18、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 L.C# As 课程ID,L.score AS 最高分,R.score AS 最低分
FROM SC L ,SC AS R
WHERE L.C# = R.C# and
L.score = (SELECT MAX(IL.score)
FROM SC AS IL,Student AS IM
WHERE L.C# = IL.C# and IM.S#=IL.S#
GROUP BY IL.C#)
AND
R.Score = (SELECT MIN(IR.score)
FROM SC AS IR
WHERE R.C# = IR.C#
GROUP BY IR.C#
);
19、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 t.C# AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS 平均成绩
,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数
FROM SC T,Course
where t.C#=course.C#
GROUP BY t.C#
ORDER BY 100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC
20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理(001),马克同(002),OO&UML (003),数据库(004)
SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企业管理平均分
,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企业管理及格百分数
,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 马克同平均分
,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 马克同及格百分数
,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分
,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分数
,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 数据库平均分
,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 数据库及格百分数
FROM SC
21、查询不同老师所教不同课程平均分从高到低显示
SELECT max(Z.T#) AS 教师ID,MAX(Z.Tname) AS 教师姓名,C.C# AS 课程ID,MAX(C.Cname) AS 课程名称,AVG(Score) AS 平均成绩
FROM SC AS T,Course AS C ,Teacher AS Z
where T.C#=C.C# and C.T#=Z.T#
GROUP BY C.C#
ORDER BY AVG(Score) DESC
22、查询如下课程成绩第 3 名到第 6 名的学生成绩单:企业管理(001),马克同(002),UML (003),数据库(004)
[学生ID],[学生姓名],企业管理,马克同,UML,数据库,平均成绩
SELECT DISTINCT top 3
SC.S# As 学生学号,
Student.Sname AS 学生姓名 ,
T1.score AS 企业管理,
T2.score AS 马克同,
T3.score AS UML,
T4.score AS 数据库,
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分
FROM Student,SC LEFT JOIN SC AS T1
ON SC.S# = T1.S# AND T1.C# = '001'
LEFT JOIN SC AS T2
ON SC.S# = T2.S# AND T2.C# = '002'
LEFT JOIN SC AS T3
ON SC.S# = T3.S# AND T3.C# = '003'
LEFT JOIN SC AS T4
ON SC.S# = T4.S# AND T4.C# = '004'
WHERE student.S#=SC.S# and
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
NOT IN
(SELECT
DISTINCT
TOP 15 WITH TIES
ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)
FROM sc
LEFT JOIN sc AS T1
ON sc.S# = T1.S# AND T1.C# = 'k1'
LEFT JOIN sc AS T2
ON sc.S# = T2.S# AND T2.C# = 'k2'
LEFT JOIN sc AS T3
ON sc.S# = T3.S# AND T3.C# = 'k3'
LEFT JOIN sc AS T4
ON sc.S# = T4.S# AND T4.C# = 'k4'
ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);
23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]
SELECT SC.C# as 课程ID, Cname as 课程名称
,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85]
,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70]
,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60]
,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -]
FROM SC,Course
where SC.C#=Course.C#
GROUP BY SC.C#,Cname;
24、查询学生平均成绩及其名次
SELECT 1+(SELECT COUNT( distinct 平均成绩)
FROM (SELECT S#,AVG(score) AS 平均成绩
FROM SC
GROUP BY S#
) AS T1
WHERE 平均成绩 > T2.平均成绩) as 名次,
S# as 学生学号,平均成绩
FROM (SELECT S#,AVG(score) 平均成绩
FROM SC
GROUP BY S#
) AS T2
ORDER BY 平均成绩 desc;
25、查询各科成绩前三名的记录:(不考虑成绩并列情况)
SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数
FROM SC t1
WHERE score IN (SELECT TOP 3 score
FROM SC
WHERE t1.C#= C#
ORDER BY score DESC
)
ORDER BY t1.C#;
26、查询每门课程被选修的学生数
select c#,count(S#) from sc group by C#;
27、查询出只选修了一门课程的全部学生的学号和姓名
select SC.S#,Student.Sname,count(C#) AS 选课数
from SC ,Student
where SC.S#=Student.S# group by SC.S# ,Student.Sname having count(C#)=1;
28、查询男生、女生人数
Select count(Ssex) as 男生人数 from Student group by Ssex having Ssex='男';
Select count(Ssex) as 女生人数 from Student group by Ssex having Ssex='女';
29、查询姓“张”的学生名单
SELECT Sname FROM Student WHERE Sname like '张%';
30、查询同名同性学生名单,并统计同名人数
select Sname,count(*) from Student group by Sname having count(*)>1;;
31、1981年出生的学生名单(注:Student表中Sage列的类型是datetime)
select Sname, CONVERT(char (11),DATEPART(year,Sage)) as age
from student
where CONVERT(char(11),DATEPART(year,Sage))='1981';
32、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 C#,Avg(score) from SC group by C# order by Avg(score),C# DESC ;
33、查询平均成绩大于85的所有学生的学号、姓名和平均成绩
select Sname,SC.S# ,avg(score)
from Student,SC
where Student.S#=SC.S# group by SC.S#,Sname having avg(score)>85;
34、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 Sname,isnull(score,0)
from Student,SC,Course
where SC.S#=Student.S# and SC.C#=Course.C# and Course.Cname='数据库'and score <60;
35、查询所有学生的选课情况;
SELECT SC.S#,SC.C#,Sname,Cname
FROM SC,Student,Course
where SC.S#=Student.S# and SC.C#=Course.C# ;
36、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 distinct student.S#,student.Sname,SC.C#,SC.score
FROM student,Sc
WHERE SC.score>=70 AND SC.S#=student.S#;
37、查询不及格的课程,并按课程号从大到小排列
select c# from sc where scor e <60 order by C# ;
38、查询课程编号为003且课程成绩在80分以上的学生的学号和姓名;
select SC.S#,Student.Sname from SC,Student where SC.S#=Student.S# and Score>80 and C#='003';
39、求选了课程的学生人数
select count(*) from sc;
40、查询选修“叶平”老师所授课程的学生中,成绩最高的学生姓名及其成绩
select Student.Sname,score
from Student,SC,Course C,Teacher
where Student.S#=SC.S# and SC.C#=C.C# and C.T#=Teacher.T# and Teacher.Tname='叶平' and SC.score=(select max(score)from SC where C#=C.C# );
41、查询各个课程及相应的选修人数
select count(*) from sc group by C#;
42、查询不同课程成绩相同的学生的学号、课程号、学生成绩
select distinct A.S#,B.score from SC A ,SC B where A.Score=B.Score and A.C# <>B.C# ;
43、查询每门功成绩最好的前两名
SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数
FROM SC t1
WHERE score IN (SELECT TOP 2 score
FROM SC
WHERE t1.C#= C#
ORDER BY score DESC
)
ORDER BY t1.C#;
44、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,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 C# as 课程号,count(*) as 人数
from sc
group by C#
order by count(*) desc,c#
45、检索至少选修两门课程的学生学号
select S#
from sc
group by s#
having count(*) > = 2
46、查询全部学生都选修的课程的课程号和课程名
select C#,Cname
from Course
where C# in (select c# from sc group by c#)
47、查询没学过“叶平”老师讲授的任一门课程的学生姓名
select Sname from Student where S# not in (select S# from Course,Teacher,SC where Course.T#=Teacher.T# and SC.C#=course.C# and Tname='叶平');
48、查询两门以上不及格课程的同学的学号及其平均成绩
select S#,avg(isnull(score,0)) from SC where S# in (select S# from SC where score <60 group by S# having count(*)>2)group by S#;
49、检索“004”课程分数小于60,按分数降序排列的同学学号
select S# from SC where C#='004'and score <60 order by score desc;
50、删除“002”同学的“001”课程的成绩
delete from Sc where S#='001'and C#='001';
问题描述:
本题用到下面三个关系表:
CARD 借书卡。 CNO 卡号,NAME 姓名,CLASS 班级
BOOKS 图书。 BNO 书号,BNAME 书名,AUTHOR 作者,PRICE 单价,QUANTITY 库存册数
BORROW 借书记录。 CNO 借书卡号,BNO 书号,RDATE 还书日期
备注:限定每人每种书只能借一本;库存册数随借书、还书而改变。
要求实现如下15个处理:
1. 写出建立BORROW表的SQL语句,要求定义主码完整性约束和引用完整性约束。
2. 找出借书超过5本的读者,输出借书卡号及所借图书册数。
3. 查询借阅了"水浒"一书的读者,输出姓名及班级。
4. 查询过期未还图书,输出借阅者(卡号)、书号及还书日期。
5. 查询书名包括"网络"关键词的图书,输出书号、书名、作者。
6. 查询现有图书中价格最高的图书,输出书名及作者。
7. 查询当前借了"计算方法"但没有借"计算方法习题集"的读者,输出其借书卡号,并按卡号降序排序输出。
8. 将"C01"班同学所借图书的还期都延长一周。
9. 从BOOKS表中删除当前无人借阅的图书记录。
10.如果经常按书名查询图书信息,请建立合适的索引。
11.在BORROW表上建立一个触发器,完成如下功能:如果读者借阅的书名是"数据库技术及应用",就将该读者的借阅记录保存在BORROW_SAVE表中(注ORROW_SAVE表结构同BORROW表)。
12.建立一个视图,显示"力01"班学生的借书信息(只要求显示姓名和书名)。
13.查询当前同时借有"计算方法"和"组合数学"两本书的读者,输出其借书卡号,并按卡号升序排序输出。
14.假定在建BOOKS表时没有定义主码,写出为BOOKS表追加定义主码的语句。
15.对CARD表做如下修改:
a. 将NAME最大列宽增加到10个字符(假定原为6个字符)。
b. 为该表增加1列NAME(系名),可变长,最大20个字符。
1. 写出建立BORROW表的SQL语句,要求定义主码完整性约束和引用完整性约束
--实现代码:
CREATE TABLE BORROW(
CNO int FOREIGN KEY REFERENCES CARD(CNO),
BNO int FOREIGN KEY REFERENCES BOOKS(BNO),
RDATE datetime,
PRIMARY KEY(CNO,BNO))
2. 找出借书超过5本的读者,输出借书卡号及所借图书册数
--实现代码:
SELECT CNO,借图书册数=COUNT(*)
FROM BORROW
GROUP BY CNO
HAVING COUNT(*)>5
3. 查询借阅了"水浒"一书的读者,输出姓名及班级
--实现代码:
SELECT * FROM CARD c
WHERE EXISTS(
SELECT * FROM BORROW a,BOOKS b
WHERE a.BNO=b.BNO
AND b.BNAME=N'水浒'
AND a.CNO=c.CNO)
4. 查询过期未还图书,输出借阅者(卡号)、书号及还书日期
--实现代码:
SELECT * FROM BORROW
WHERE RDATE<GETDATE()
5. 查询书名包括"网络"关键词的图书,输出书号、书名、作者
--实现代码:
SELECT BNO,BNAME,AUTHOR FROM BOOKS
WHERE BNAME LIKE N'%网络%'
6. 查询现有图书中价格最高的图书,输出书名及作者
--实现代码:
SELECT BNO,BNAME,AUTHOR FROM BOOKS
WHERE PRICE=(
SELECT MAX(PRICE) FROM BOOKS)
7. 查询当前借了"计算方法"但没有借"计算方法习题集"的读者,输出其借书卡号,并按卡号降序排序输出
--实现代码:
SELECT a.CNO
FROM BORROW a,BOOKS b
WHERE a.BNO=b.BNO AND b.BNAME=N'计算方法'
AND NOT EXISTS(
SELECT * FROM BORROW aa,BOOKS bb
WHERE aa.BNO=bb.BNO
AND bb.BNAME=N'计算方法习题集'
AND aa.CNO=a.CNO)
ORDER BY a.CNO DESC
8. 将"C01"班同学所借图书的还期都延长一周
--实现代码:
UPDATE b SET RDATE=DATEADD(Day,7,b.RDATE)
FROM CARD a,BORROW b
WHERE a.CNO=b.CNO
AND a.CLASS=N'C01'
9. 从BOOKS表中删除当前无人借阅的图书记录
--实现代码:
DELETE A FROM BOOKS a
WHERE NOT EXISTS(
SELECT * FROM BORROW
WHERE BNO=a.BNO)
10. 如果经常按书名查询图书信息,请建立合适的索引
--实现代码:
CREATE CLUSTERED INDEX IDX_BOOKS_BNAME ON BOOKS(BNAME)
11. 在BORROW表上建立一个触发器,完成如下功能:如果读者借阅的书名是"数据库技术及应用",就将该读者的借阅记录保存在BORROW_SAVE表中(注ORROW_SAVE表结构同BORROW表)
--实现代码:
CREATE TRIGGER TR_SAVE ON BORROW
FOR INSERT,UPDATE
AS
IF @@ROWCOUNT>0
INSERT BORROW_SAVE SELECT i.*
FROM INSERTED i,BOOKS b
WHERE i.BNO=b.BNO
AND b.BNAME=N'数据库技术及应用'
12. 建立一个视图,显示"力01"班学生的借书信息(只要求显示姓名和书名)
--实现代码:
CREATE VIEW V_VIEW
AS
SELECT a.NAME,b.BNAME
FROM BORROW ab,CARD a,BOOKS b
WHERE ab.CNO=a.CNO
AND ab.BNO=b.BNO
AND a.CLASS=N'力01'
13. 查询当前同时借有"计算方法"和"组合数学"两本书的读者,输出其借书卡号,并按卡号升序排序输出
--实现代码:
SELECT a.CNO
FROM BORROW a,BOOKS b
WHERE a.BNO=b.BNO
AND b.BNAME IN(N'计算方法',N'组合数学')
GROUP BY a.CNO
HAVING COUNT(*)=2
ORDER BY a.CNO DESC
14. 假定在建BOOKS表时没有定义主码,写出为BOOKS表追加定义主码的语句
--实现代码:
ALTER TABLE BOOKS ADD PRIMARY KEY(BNO)
15.1 将NAME最大列宽增加到10个字符(假定原为6个字符)
--实现代码:
ALTER TABLE CARD ALTER COLUMN NAME varchar(10)
15.2 为该表增加1列NAME(系名),可变长,最大20个字符
--实现代码:
ALTER TABLE CARD ADD 系名 varchar(20)
问题描述:
为管理岗位业务培训信息,建立3个表:
S (S#,SN,SD,SA) S#,SN,SD,SA 分别代表学号、学员姓名、所属单位、学员年龄
C (C#,CN ) C#,CN 分别代表课程编号、课程名称
SC ( S#,C#,G ) S#,C#,G 分别代表学号、所选修的课程编号、学习成绩
要求实现如下5个处理:
1. 使用标准SQL嵌套语句查询选修课程名称为’税收基础’的学员学号和姓名
2. 使用标准SQL嵌套语句查询选修课程编号为’C2’的学员姓名和所属单位
3. 使用标准SQL嵌套语句查询不选修课程编号为’C5’的学员姓名和所属单位
4. 使用标准SQL嵌套语句查询选修全部课程的学员姓名和所属单位
5. 查询选修了课程的学员人数
6. 查询选修课程超过5门的学员学号和所属单位
1. 使用标准SQL嵌套语句查询选修课程名称为’税收基础’的学员学号和姓名
--实现代码:
SELECT SN,SD FROM S
WHERE [S#] IN(
SELECT [S#] FROM C,SC
WHERE C.[C#]=SC.[C#]
AND CN=N'税收基础')
2. 使用标准SQL嵌套语句查询选修课程编号为’C2’的学员姓名和所属单位
--实现代码:
SELECT S.SN,S.SD FROM S,SC
WHERE S.[S#]=SC.[S#]
AND SC.[C#]='C2'
3. 使用标准SQL嵌套语句查询不选修课程编号为’C5’的学员姓名和所属单位
--实现代码:
SELECT SN,SD FROM S
WHERE [S#] NOT IN(
SELECT [S#] FROM SC
WHERE [C#]='C5')
4. 使用标准SQL嵌套语句查询选修全部课程的学员姓名和所属单位
--实现代码:
SELECT SN,SD FROM S
WHERE [S#] IN(
SELECT [S#] FROM SC
RIGHT JOIN C ON SC.[C#]=C.[C#]
GROUP BY [S#]
HAVING COUNT(*)=COUNT(DISTINCT [S#]))
5. 查询选修了课程的学员人数
--实现代码:
SELECT 学员人数=COUNT(DISTINCT [S#]) FROM SC
6. 查询选修课程超过5门的学员学号和所属单位
--实现代码:
SELECT SN,SD FROM S
WHERE [S#] IN(
SELECT [S#] FROM SC
GROUP BY [S#]
HAVING COUNT(DISTINCT [C#])>5)
if not object_id('cj')is null
drop table cj
go
create table cj(stuName nvarchar(10),KCM nvarchar(10),cj numeric(5,2))
insert into cj select '张三','语文',98
union select '李四','语文',89
union select '王五','语文',67
union select '周攻','语文',56
union select '张三','数学',89
union select '李四','数学',78
union select '王五','数学',90
union select '周攻','数学',87
方法一:
select stuname from
(select stuName,kcm,(select count(*) from cj where stuname!=a.stuname and kcm=a.kcm and cj>a.cj) cnt from cj a) x
group by stuname having max(cnt)<=1
go
方法二:
SELECT stuname FROM cj1 a
where cj IN(SELECT TOP 2 cj FROM cj1 WHERE kcm=a.kcm ORDER BY cj desc)
GROUP BY stuname HAVING(count(1)>1)
方法三:
select distinct stuname from cj a
where not exists(select kcm from cj b where a.stuname=stuname
and (select count(*) from cj where kcm=b.kcm and stuname!=a.stuname and cj>b.cj)>1)
SQLSEREVER测试题(上)
一 SQLSERVER管理部分
1 请讲出身份验证模式与登录帐号的关系及如何用各种帐号进行登录,并画出示意图
2 请讲出登录帐号、数据库用户及数据库角色之间的关系,并画出示意图
3 请讲出数据库用户、数据库角色与数据库对象之间的关系,并画出直接对用户授权与间接对用户授权(系统权限与对象权限)的方法
4 请讲出服务器角色、数据库角色、标准角色与应用程序角色的区别与验证其权限的方法
5 请讲出数据库还原模型对数据库的影响
6 有一个执行关键任务的数据库,请设计一个数据库备份策略
7 请使用文件与文件组恢复的方式恢复数据库
8 请使用事务日志恢复数据库到一个时间点
9 请设计作业进行周期性的备份数据库
10 如何监控数据库的阻塞,并实现数据库的死锁测试
11 如何监控数据库的活动,并能使用索引优化向导生成索引
12 理解数据库框图的作用并可以设计表与表之间的关系
SQLSEREVER测试题(中)
二 SQLSERVER的实现部分
1 有订单表,需要实现它的编号,格式如下:200211030001……200222039999等
2 有表T1,T2,现有一事务,在向表T1添加数据时,同时也必须向T2也添加数据,如何实现该事务
3 如何向T1中的编号字段(code varchar(20))添加一万条记录,不充许重复,规则如下:编号的数据必须从小写的a-z之间取值
4 如何删除表中的重复数据,请使用游标与分组的办法
5 如何求表中相邻的两条记录的某字段的值之差
6 如何统计数据库中所有用户表的数据,显示格式如下:
表名 记录数
sales 23
7 如何删除数据库中的所有用户表(表与表之间有外键关系)
8 表A editor_id lb2_id
123 000
123 003
123 003
456 007
456 006
表B lb2_id lb2_name
000 a
003 b
006 c
007 d
显示 a 共1条 (表A内lb2_id为000的条数)
b 共2条(表A内lb2_id为003的条数)
9 人员情况表(employee):里面有一字段文化程度(wh):包括四种情况(本科以上,大专,高中,初中以下),现在我要根据年龄字段查询统计出:表中文化程度为本科以上,大专,高中,初中以下,各有多少人,占总人数多少。
SELECT wh AS 学历,age as 年龄, Count(*) AS 人数,
Count(*) * 100 /(SELECT Count(*) FROM employee) AS 百分比
FROM employee GROUP BY wh,age
学历 年龄 人数 百分比
本科以上 20 34 14
大专 20 33 13
高中 20 33 13
初中以下 20 100 40
本科以上 21 50 20
10 现在有三个表student:(FID 学生号,FName 姓名),
subject:(FSubID 课程号,FSubName 课程名),
Score(FScoreId 成绩记录号,FSubID 课程号,FStdID 学生号,FScore 成绩)
怎么能实现这个表:
姓名 英语 数学 语文 历史
张萨 78 67 89 76
王强 89 67 84 96
SELECT a.FName AS 姓名,
英语 = SUM(CASE b.FSubName WHEN '英语' THEN c.FScore END),
数学 = SUM(CASE b.FSubName WHEN '数学' THEN c.FScore END),
语文 = SUM(CASE b.FSubName WHEN '语文' THEN c.FScore END),
历史 = SUM(CASE b.FSubName WHEN '历史' THEN c.FScore END)
FROM Student a, Subject b, Score c
WHERE a.FID = c.FStdId AND b.FSubID = c.FsubID GROUP BY a.FName
11 原始表的数据如下:
PID PTime PNo
111111 2003-01-28 04:30:09
111111 2003-01-28 18:30:00
222222 2003-01-28 04:31:09
333333 2003-01-28 04:32:09
111111 2003-02-09 03:35:25
222222 2003-02-09 03:36:25
333333 2003-02-09 03:37:25
查询生成表
PDate 111111 222222 333333 ......
2003-01-28 04:30:09 04:31:09 04:32:09 ......
2003-01-28 18:30:00
2003-02-09 03:35:25 03:36:25 03:37:25 ......
12 表一(AAA)
商品名称mc 商品总量sl
A 100
B 120
表二(BBB)
商品名称mc 出库数量sl
A 10
A 20
B 10
B 20
B 30
用一条SQL语句算出商品A,B目前还剩多少?
一
declare @AAA table (商品名称 varchar(10), 商品总量 int)
insert into @AAA values('A',100)
insert into @AAA values('B',120)
declare @BBB table (商品名称 varchar(10), 出库数量 int)
insert into @BBB values('A', 10)
insert into @BBB values('A', 20)
insert into @BBB values('B', 10)
insert into @BBB values('B', 20)
insert into @BBB values('B', 30)
select TA.商品名称,A-B AS 剩余数量 FROM
(select 商品名称,sum(商品总量) AS A
from @AAA
group by 商品名称)TA,
(select 商品名称,sum(出库数量) AS B
from @BBB
group by 商品名称)TB
where TA.商品名称=TB.商品名称
二
select 商品名称,sum(商品总量) 剩余数量 from (select * from @aaa union all select 商品名称,-出库数量 from @bbb) a group by 商品名称
13 优化这句SQL语句
UPDATE tblExlTempYear
SET tblExlTempYear.GDQC = tblExlTempMonth.GDQC
FROM tblExlTempYear,tblExlTempMonth
where tblExlTempMonth.GDXM=tblExlTempYear.GDXM and tblExlTempMonth.TXDZ=tblExlTempYear.TXDZ
(1)、加索引:
tblExlTempYear(GDXM,TXDZ)
tblExlTempMonth (GDXM,TXDZ)
(2)、删除无用数据
(3)、转移过时数据
(4)、加服务器内存,升级服务器
(5)、升级网络系统
UPDATE tblExlTempYear
SET tblExlTempYear.GDQC = tblExlTempMonth.GDQC
FROM tblExlTempYear (index indexY),tblExlTempMonth (index indexM)
where tblExlTempMonth.GDXM=tblExlTempYear.GDXM and tblExlTempMonth.TXDZ=tblExlTempYear.TXDZ
14 品种 日期 数量
P0001 2002-1-10 10
P0001 2002-1-10 11
P0001 2002-1-10 50
P0001 2002-1-12 9
P0001 2002-1-12 8
P0001 2002-1-12 7
P0002 2002-10-10 5
P0002 2002-10-10 7
P0002 2002-10-12 0.5
P0003 2002-10-10 5
P0003 2002-10-12 7
P0003 2002-10-12 9
结果要先按照品种汇总,再按照日期汇总,结果如下:
P0001 2002-1-10 71
P0001 2002-1-12 24
P0002 2002-10-10 12
P0002 2002-10-12 0.5
P0003 2002-10-10 5
P0003 2002-10-12 16
SQL SERVER能做出这样的汇总吗…
15 在分組查循中with{cube|rollup}的區別是什么?
如:
use pangu
select firm_id,p_id,sum(o_price_quantity)as sum_values
from orders
group by firm_id,p_id
with cube
與
use pangu
select firm_id,p_id,sum(o_price_quantity)as sum_values
from orders
group by firm_id,p_id
with rollup
的區別是什么?
CUBE 和 ROLLUP 之间的区别在于:
CUBE 生成的结果集显示了所选列中值的所有组合的聚合。
ROLLUP 生成的结果集显示了所选列中值的某一层次结构的聚合。
例如,简单表 Inventory 中包含:
Item Color Quantity
-------------------- -------------------- --------------------------
Table Blue 124
Table Red 223
Chair Blue 101
Chair Red 210
下列查询将生成小计报表:
SELECT CASE WHEN (GROUPING(Item) = 1) THEN 'ALL'
ELSE ISNULL(Item, 'UNKNOWN')
END AS Item,
CASE WHEN (GROUPING(Color) = 1) THEN 'ALL'
ELSE ISNULL(Color, 'UNKNOWN')
END AS Color,
SUM(Quantity) AS QtySum
FROM Inventory
GROUP BY Item, Color WITH ROLLUP
Item Color QtySum
-------------------- -------------------- --------------------------
Chair Blue 101.00
Chair Red 210.00
Chair ALL 311.00
Table Blue 124.00
Table Red 223.00
Table ALL 347.00
ALL ALL 658.00
(7 row(s) affected)
如果查询中的 ROLLUP 关键字更改为 CUBE,那么 CUBE 结果集与上述结果相同,只是在结果集的末尾还会返回下列两行:
ALL Blue 225.00
ALL Red 433.00
CUBE 操作为 Item 和 Color 中值的可能组合生成行。例如,CUBE 不仅报告与 Item 值 Chair 相组合的 Color 值的所有可能组合(Red、Blue 和 Red + Blue),而且报告与 Color 值 Red 相组合的 Item 值的所有可能组合(Chair、Table 和 Chair + Table)。对于 GROUP BY 子句中右边的列中的每个值,ROLLUP 操作并不报告左边一列(或左边各列)中值的所有可能组合。例如,ROLLUP 并不对每个 Color 值报告 Item 值的所有可能组合。ROLLUP 操作的结果集具有类似于 COMPUTE BY 所返回结果集的功能;然而,
ROLLUP 具有下列优点: ROLLUP 返回单个结果集;COMPUTE BY 返回多个结果集,而多个结果集会增加应用程序代码的复杂性。ROLLUP 可以在服务器游标中使用;COMPUTE BY 不可以。有时,查询优化器为 ROLLUP 生成的执行计划比为 COMPUTE BY 生成的更为高效。
16 假如我有两个表
表1(电话号码,是否存在)
表2(电话号码,是否拨打)
想查找表1中的电话号码是否在表2中存在,如果存在就更新表1中的是否存在字段为1。
UPDATE 表1 SET 是否存在=1
WHERE EXISTS(SELECT * FROM 表2 WHERE 表2.电话号码 = 表1.电话号码)
17 用存储过程调用外部程序.
不过要做成com控件
用sp_OACreate存储过程)
DECLARE @object int
DECLARE @hr int
DECLARE @src varchar(255), @desc varchar(255)
EXEC @hr = sp_OACreate 'SQLDMO.SQLServer', @object OUT
IF @hr <> 0
BEGIN
EXEC sp_OAGetErrorInfo @object, @src OUT, @desc OUT
SELECT hr=convert(varbinary(4),@hr), Source=@src, Description=@desc
RETURN
END
1、在MS SQL Server中,用来显示数据库信息的系统存储过程是( )
A sp_ dbhelp
B sp_ db
C sp_ help
D sp_ helpdb
2、SQL语言中,删除一个表的命令是( )
A DELETE
B DROP
C CLEAR
D REMORE
3、关系数据库中,主键是(__)
A、为标识表中唯一的实体
B、创建唯一的索引,允许空值
C、只允许以表中第一字段建立
D、允许有多个主键的
4、在Transact-SQL语法中,SELECT语句的完整语法较复杂,但至少包括的部分(1___),使用关键字(2___)可以把重复行屏蔽,将 多个查询结果返回一个结果集合的运算符是(3___),如果在SELECT语句中使用聚合函数时,一定在后面使用(4___)。
⑴ A、SELECT,INTO B、SELECT,FROM
C、SELECT,GROUP D、仅SELECT
⑵ A、DISTINCT B、UNION
C、ALL C、TOP
⑶ A、JOIN B、UNION
C、INTO C、LIKE
⑷ A、GROUP BY B、COMPUTE BY
C、HAVING D、COMPUTE
5、语句DBCC SHRINKDATABASE (Sample, 25)中的25表示的意思是
A、25M
B、剩余占整个空间的25%
C、已用空间占整个空间的25%
D、以上都不对
6、你是一个保险公司的数据库开发人员,公司的保单信息存储在SQL Server 2000数据库中,你使用以下脚本建立了一个名为Policy的表:
CREATE TABLE Policy
(
PolicyNumber int NOT NULL DEFAULT (0),
InsuredLastName char (30) NOT NULL,
InsuredFirstName char (20) NOT NULL,
InsuredBirthDate datetime NOT NULL,
PolicyDate datetime NOT NULL,
FaceAmount money NOT NULL,
CONSTRAINT PK_Policy PRIMARY KEY (PolicyNumber)
)
每次公司销售出一份保单,Policy表中就增加一条记录,并赋予其一个新的保单号,你将怎么做?
a.建立一个INSTEAD OF INSERT触发器来产生一个新的保单号,并将这个保单号插入数据表中。
b.建立一个INSTEAD OF UPDATE触发器来产生一个新的保单号,并将这个保单号插入数据表中。
c.建立一个AFTER UPDATE触发器来产生一个新的保单号,并将这个保单号插入数据表中。
d.用AFTER UPDATE触发器替代DEFAULT约束条件产生一个新的保单号,并将这个保单号插入数据表中。
7、在SQL语言中,如果要建立一个工资表包含职工号,姓名,职称。工资等字段。若要保证工资字段的取值不低于800元,最合适的实现方法是:
A。在创建工资表时为”工资“字段建立缺省
B。在创建工资表时为”工资“字段建立检查约束
C。在工资表建立一个触发器
D。为工资表数据输入编写一个程序进行控制
8、Select 语句中用来连接字符串的符号是______.
A. “+” B. “&” C.“||” D.“|”
9、你是一个出版公司的数据库开发人员,对特定的书名的每天的销售情况建立了如下的存储过程:
CREATE PROCEDURE get_sales_for_title
title varchar(80), @ytd_sales int OUTPUT
AS
SELECT @ytd_sales = ytd_sales
FROM titles
WHERE title = @title
IF @@ROWCOUNT = 0
RETURN(-1)
ELSE
RETURN(0)
另外建立了一个脚本执行这个存储过程,如果执行成功,将返回对应于书名的每天的销售情况的报表,如果执行失败,将返回“No Sales Found”,怎样建立这个脚本?
A. DECLARE @retval int
DECLARE @ytd int
EXEC get_sales_for_title ‘Net Etiquette’, @ytd
IF @retval < 0
PRINT ‘No sales found’
ELSE
PRINT ‘Year to date sales: ’ + STR (@ytd)
GO
B. DECLARE @retval int
DECLARE @ytd int
EXEC get_sales_for_title ‘Net Etiquette’, @ytd OUTPUT
IF @retval < 0
PRINT ‘No sales found’
ELSE
PRINT ‘Year to date sales: ’ + STR (@ytd)
GO
C. DECLARE @retval int
DECLARE @ytd int
EXEC get_sales_for_title ‘Net Etiquette’,@retval OUTPUT
IF @retval < 0
PRINT ‘No sales found’
ELSE
PRINT ‘Year to date sales: ’ + STR (@ytd)
GO
D. DECLARE @retval int
DECLARE @ytd int
EXEC @retval = get_sales_for_title ‘Net Etiquette’, @ytd OUTPUT
IF @retval < 0
PRINT ‘No sales found’
ELSE
PRINT ‘Year to date sales: ’ + STR (@ytd)
GO
10、You are a database developer for a container manufacturing company. The containers produced by your company are a number of different sizes and shapes. The tables that store the container information are shown in the Size, Container, and Shape Tables exhibit:
Size
SizeID
SizeName
Height
Container
ContainerID
ShapeID
SizeID
Shape
ShapeID
ShapeName
Measurements
A sample of the data stored in the tables is shown below:
Size Table
SizeID SizeName Height
1 Small 40
2 Medium 60
3 Large 80
4 Jumbo 100
Shape Table
ShapeID ShapeName Measurement
1 Triangle 10
2 Triangle 20
3 Triangle 30
4 Square 20
5 Square 30
6 Square 40
7 Circle 15
8 Circle 25
9 Circle 35
Periodically, the dimensions of the containers change. Frequently, the database users require the volume of a container. The volume of a container is calculated based on information in the shape and size tables.
You need to hide the details of the calculation so that the volume can be easily accessed in a SELECT query with the rest of the container information. What should you do?
A. Create a user-defined function that requires ContainerID as an argument and returns the volume of the container.
B. Create a stored procedure that requires ContainerID as an argument and returns the volume of the container.
C. Add a column named volume to the container table. Create a trigger that calculates and stores volume in this column when a new container is inserted into the table.
D. Add a computed column to the container table that calculates the volume of the container.
填空题(1空1分共20分)
1、 如果设计的表不符合第二范式,可能会导致_______,________,_______。
2、 SQL是由_______语言,________语言,_______语言组成。
3、 SQL Server在两个安全级上验证用户,分别是______________,_____________________。
4、 自定义函数由___________函数,_______________函数,___________________函数组成。
5、 备份策略的三种类型是__________备份,_______________备份,___________________备份组成。
6、 启动一个显式事务的语句为__________,提交事务的语句为__________,回滚事务的语句为__________
7、 表的每一行在表中是惟一的实体属于__________完整性,使列的输入有效属于__________完整性,两个表的主关键字和外关键字的数据应该对应一致属于__________完整性。
简答题(共20分)
1、 在帮助中[ ,...n ] 意思是什么?(4分)
2、 请简述一下第二范式(4分)
3、 现有1销售表,它们结构如下:(4分)
id int (标识号)
codno char(7) (商品编码)
codname varchar(30) (商品名称)
spec varchar(20) (商品规格)
price numeric(10,2) (价格)
sellnum int (销售数量)
deptno char(3) (售出分店编码)
selldate datetime (销售时间)
要求:写出查询销售时间段在2002-2-15日到2002-4-29之间,分店编码是01的所有记录。
4、写一个存储过程,要求传入一个表名,返回该表的记录数(假设传入的表在数据库中都存在)(4分)
5、请简述UPDATE 触发器如何工作原理。(4分)
简答题:(共40分)
1、(5分)使用一条SQL语句找到重复的值及重复的次数:有一数据表ZD_ks,其中有字段BM,MC,。。。,请查询出在ZD_ks中BM有重复的值及重复的次数,没有的不要列出。如下表:
BM DUPCOUNT
001 3
002 2
2、描述(5分)
表1 student 学生信息表
ID int 学生编号
Name varchar 学生姓名
Sex bit 性别(男0女1)
Class int 班级编号
表2 schedule 课程信息表
ID int 课程编号
Name varchar 课程名称
表3 Grade 成绩信息表
ID int 自动编号
UID int 学生编号
SID int 课程编号
Num int 考试成绩
(a)求各班的总人数(1分)
(b)求1班女生和男生的平均成绩(2分)
(c)各班"数据结构"(课程名称)不及格的人数(2分)
3、问题描述:(30分)
本题用到下面三个关系表:
CARD 借书卡。 CNO 卡号,NAME 姓名,CLASS 班级
BOOKS 图书。 BNO 书号,BNAME 书名,AUTHOR 作者,PRICE 单价,QUANTITY 库存册数
BORROW 借书记录。 CNO 借书卡号,BNO 书号,RDATE 还书日期
备注:限定每人每种书只能借一本;库存册数随借书、还书而改变。
要求实现如下15个处理:
1.找出借书超过5本的读者,输出借书卡号及所借图书册数。(2分)
2.查询借阅了"水浒"一书的读者,输出姓名及班级。(3分)
3.查询过期未还图书,输出借阅者(卡号)、书号及还书日期。(3分)
4.查询书名包括"网络"关键词的图书,输出书号、书名、作者。(2分)
5.查询现有图书中价格最高的图书,输出书名及作者。(2分)
6.查询当前借了"计算方法"但没有借"计算方法习题集"的读者,输出其借书卡号,并按卡号降序排序输出。(4分)
7.将"C01"班同学所借图书的还期都延长一周。(2分)
8.从BOOKS表中删除当前无人借阅的图书记录。(2分)
9.在BORROW表上建立一个触发器,完成如下功能:如果读者借阅的书名是"数据库技术及应用",就将该读者的借阅记录保存在BORROW_SAVE表中(注ORROW_SAVE表结构同BORROW表)。(4分)
10.建立一个视图,显示"力01"班学生的借书信息(只要求显示姓名和书名)。(3分)
11.查询当前同时借有"计算方法"和"组合数学"两本书的读者,输出其借书卡号,并按卡号升序排序输出。(3分)
第二套
1、问题描述:
已知关系模式:
S (SNO,SNAME) 学生关系。SNO 为学号,SNAME 为姓名
C (CNO,CNAME,CTEACHER) 课程关系。CNO 为课程号,CNAME 为课程名,CTEACHER 为任课教师
SC(SNO,CNO,SCGRADE) 选课关系。SCGRADE 为成绩
要求实现如下5个处理:
1. 找出没有选修过“李明”老师讲授课程的所有学生姓名
2. 列出有二门以上(含两门)不及格课程的学生姓名及其平均成绩
3. 列出既学过“1”号课程,又学过“2”号课程的所有学生姓名
4. 列出“1”号课成绩比“2”号同学该门课成绩高的所有学生的学号
5. 列出“1”号课成绩比“2”号课成绩高的所有学生的学号及其“1”号课和“2”号课的成绩
2、问题描述:
为管理岗位业务培训信息,建立3个表:
S (S#,SN,SD,SA) S#,SN,SD,SA 分别代表学号、学员姓名、所属单位、学员年龄
C (C#,CN ) C#,CN 分别代表课程编号、课程名称
SC ( S#,C#,G ) S#,C#,G 分别代表学号、所选修的课程编号、学习成绩
要求实现如下5个处理:
1. 使用标准SQL嵌套语句查询选修课程名称为’税收基础’的学员学号和姓名
2. 使用标准SQL嵌套语句查询选修课程编号为’C2’的学员姓名和所属单位
3. 使用标准SQL嵌套语句查询不选修课程编号为’C5’的学员姓名和所属单位
4. 使用标准SQL嵌套语句查询选修全部课程的学员姓名和所属单位
5. 查询选修了课程的学员人数
6. 查询选修课程超过5门的学员学号和所属单位
有重复的再发
Answer 1:找出当月的天数
select datepart(dd,dateadd(dd,-1,dateadd(mm,1,cast(cast(year(getdate()) as varchar)+'-'+cast(month(getdate()) as varchar)+'-01' as datetime))))
Question2:Can you use a SQL statement to calculating it!
How can I print "10 to 20" for books that sell for between $10 and $20,"unknown" for books whose price is null, and "other" for all other prices?
Answer 2:
select bookid,bookname,price=case when price is null then 'unknown'
when price between 10 and 20 then '10 to 20' else price end
from books
Question3:Can you use a SQL statement to finding duplicate values!
How can I find authors with the same last name?
You can use the table authors in datatabase pubs. I want to get the result as below:
Output:
au_lname number_dups
---------------------------------------- -----------
Ringer 2
(1 row(s) affected)
Answer 3
select au_lname,number_dups=count(1) from authors group by au_lname
Question4:Can you create a cross-tab report in my SQL Server!
How can I get the report about sale quality for each store and each quarter and the total sale quality for each quarter at year 1993?
You can use the table sales and stores in datatabase pubs.
Table Sales record all sale detail item for each store. Column store_id is the id of each store, ord_date is the order date of each sale item, and column qty is the sale qulity. Table stores record all store information.
I want to get the result look like as below:
Output:
stor_name Total Qtr1 Qtr2 Qtr3 Qtr4
---------------------------------------- ----------- ----------- ----------- ----------- -----------
Barnum's 50 0 50 0 0
Bookbeat 55 25 30 0 0
Doc-U-Mat: Quality Laundry and Books 85 0 85 0 0
Fricative Bookshop 60 35 0 0 25
Total 250 60 165 0 25
Answer 4:用动态SQL实现
Question5: The Fastest Way to Recompile All Stored Procedures
I have a problem with a database running in SQL Server 6.5 (Service Pack 4). We moved the database (object transfer) from one machine to another last night, and an error (specific to a stored procedure) is cropping up. However, I can't tell which procedure is causing it. Permissions are granted in all of our stored procedures; is there a way from the isql utility to force all stored procedures to recompile?
Tips: sp_recompile can recomplie a store procedure each time
Answer 5:在执行存储过程时,使用 with recompile 选项强制编译新的计划;使用sp_recompile系统存储过程强制在下次运行时进行重新编译
Question6: How can I add row numbers to my result set?
In database pubs, have a table titles , now I want the result shown as below,each row have a row number, how can you do that?
Result:
line-no title_id
----------- --------
1 BU1032
2 BU1111
3 BU2075
4 BU7832
5 MC2222
6 MC3021
7 MC3026
8 PC1035
9 PC8888
10 PC9999
11 PS1372
12 PS2091
13 PS2106
14 PS3333
15 PS7777
16 TC3218
17 TC4203
18 TC7777
Answer 6:
--SQL 2005的写法
select row_number() as line_no ,title_id from titles
--SQL 2000的写法
select line_no identity(int,1,1),title_id into #t from titles
select * from #t
drop table #t
Question 7: Can you tell me what the difference of two SQL statements at performance of execution?
Statement 1:
if NOT EXISTS ( select * from publishers where state = 'NY')
begin
SELECT 'Sales force needs to penetrate New York market'end
else
begin
SELECT 'We have publishers in New York'
end
Statement 2:
if EXISTS ( select * from publishers where state = 'NY')
begin
SELECT 'We have publishers in New York'
end
else
begin
SELECT 'Sales force needs to penetrate New York market'
end
Answer 7:不同点:执行时的事务数,处理时间,从客户端到服务器端传送的数据量大小
Question8: How can I list all California authors regardless of whether they have written a book?
In database pubs, have a table authors and titleauthor , table authors has a column state, and titleauhtor have books each author written.
CA behalf of california in table authors.
Answer 8:
select * from authors where state='CA'
Question9: How can I get a list of the stores that have bought both 'bussiness' and 'mod_cook' type books?
In database pubs, use three table stores,sales and titles to implement this requestment.
Now I want to get the result as below:
stor_id stor_name
------- ----------------------------------------
...
7896 Fricative Bookshop
...
...
...
Answer 9:
select distinct a.stor_id, a.stor_name from stores a,sales b,titles c
where a.stor_id=b.stor_id and b.title_id=c.title_id and c.type='business' and
exists(select 1 from sales k,titles g where stor_id=b.stor_id
and k.title_id=g.title_id and g.type='mod_cook')
Question10: How can I list non-contignous data?
In database pubs, I create a table test using statement as below, and I insert several row as below
create table test
( id int primary key )
go
insert into test values (1 )
insert into test values (2 )
insert into test values (3 )
insert into test values (4 )
insert into test values (5 )
insert into test values (6 )
insert into test values (8 )
insert into test values (9 )
insert into test values (11)
insert into test values (12)
insert into test values (13)
insert into test values (14)
insert into test values (18)
insert into test values (19)
go
Now I want to list the result of the non-contignous row as below,how can I do it?
Missing after Missing before
------------- --------------
6 8
9 11
...
Answer 10:
select id from test t where not exists(select 1 from test where id=t.id+1)
or not exists(select 1 from test where id=t.id-1)
Question11: How can I list all book with prices greather than the average price of books of the same type?
In database pubs, have a table named titles , its column named price mean the price of the book, and another named type mean the type of books.
Now I want to get the result as below:
type title price
------------ -------------------------------------------------------------------------------- ---------------------
business The Busy Executive's Database Guide 19.9900
...
...
...
...
Answer 11:
select a.type,a.title,a.price from titles a,
(select type,price=avg(price) from titles group by type)b
where a.type=b.type and a.price>b.price
向T1中的编号字段(code varchar(20))添加一万条记录,不充许重复:
网上有给出的答案:
create table #tmp(id char(1),name char(1))
create table #tmp1(id varchar(10))
go
insert #tmp(id,name) values(0,'a')
insert #tmp(id,name) values(1,'b')
insert #tmp(id,name) values(2,'c')
insert #tmp(id,name) values(3,'d')
insert #tmp(id,name) values(4,'e')
insert #tmp(id,name) values(5,'f')
insert #tmp(id,name) values(6,'g')
insert #tmp(id,name) values(7,'h')
insert #tmp(id,name) values(8,'i')
insert #tmp(id,name) values(9,'j')
go
declare @t varchar(10)
set @t=10000
while @t <=20000
begin
insert #tmp1 values(@t)
set @t=@t+1
end
go
insert t1(code)
select (select name from #tmp where id=left(a.id,1))+
(select name from #tmp where id=substring(a.id,2,1))+
(select name from #tmp where id=substring(a.id,3,1))+
(select name from #tmp where id=substring(a.id,4,1))+
(select name from #tmp where id=right(a.id,1))
from #tmp1 a
go
drop table #tmp
drop table #tmp1
go
这样做,确实没想到,测试后本机用了5秒(不往T1里面插入数据,用#T1做临时表,只有一个Code字段),后改成我这样的写法,用时3秒.
declare @i int,@j int,@r int,@acount int
create table #tmp(id int null, code varchar(3) null)
declare @ichar char(1)
declare @jchar char(1)
declare @rchar char(1)
select @i=0
select @j=0
select @r=0
select @acount=0
select @ichar=''
while @i <26
begin
select @ichar=char(97+@i)
select @j=0
while @j <26
begin
select @jchar=char(97+@j)
select @r=0
while @r <26
begin
select @rchar=char(97+@r)
select @acount=@acount+1
if @acount>10000
break
insert into #tmp(id,code)
select @acount,@ichar+@jchar+@rchar
select @r=@r+1
end
if @acount>10000
break
select @j=@j+1
end
if @acount>10000
break
select @i=@i+1
end
insert t1(code)
select code from #tmp order by id
go
drop table #tmp
################################################################
oracle 存储过程的基本语法
1.基本结构
CREATE OR REPLACE PROCEDURE 存储过程名字
(
参数1 IN NUMBER,
参数2 IN NUMBER
) IS
变量1 INTEGER :=0;
变量2 DATE;
BEGIN
END 存储过程名字
2.SELECT INTO STATEMENT
将select查询的结果存入到变量中,可以同时将多个列存储多个变量中,必须有一条
记录,否则抛出异常(如果没有记录抛出NO_DATA_FOUND)
例子:
BEGIN
SELECT col1,col2 into 变量1,变量2 FROM typestruct where xxx;
EXCEPTION
WHEN NO_DATA_FOUND THEN
xxxx;
END;
...
3.IF 判断
IF V_TEST=1 THEN
BEGIN
do something
END;
END IF;
4.while 循环
WHILE V_TEST=1 LOOP
BEGIN
XXXX
END;
END LOOP;
5.变量赋值
V_TEST := 123;
6.用for in 使用cursor
...
IS
CURSOR cur IS SELECT * FROM xxx;
BEGIN
FOR cur_result in cur LOOP
BEGIN
V_SUM :=cur_result.列名1+cur_result.列名2
END;
END LOOP;
END;
7.带参数的cursor
CURSOR C_USER(C_ID NUMBER) IS SELECT NAME FROM USER WHERE TYPEID=C_ID;
OPEN C_USER(变量值);
LOOP
FETCH C_USER INTO V_NAME;
EXIT FETCH C_USER%NOTFOUND;
do something
END LOOP;
CLOSE C_USER;
8.用pl/sql developer debug
连接数据库后建立一个Test WINDOW
在窗口输入调用SP的代码,F9开始debug,CTRL+N单步调试
#############oracle function##################
函数
? --没有参数的函数
? create or replace function get_user return varchar2 is
? v_user varchar2(50);
? begin
? select username into v_user from user_users;
? return v_user;
? end get_user;
?
? --测试
? 方法一
? select get_user from dual;
?
? 方法二
? SQL> var v_name varchar2(50)
? SQL> exec :v_name:=get_user;
1. --带有IN参数的函数
2. create or replace function get_empname(v_id in number) return varchar2 as
3. v_name varchar2(50);
4. begin
5. select name into v_name from employee where id = v_id;
6. return v_name;
7. exception
8. when no_data_found then
9. raise_application_error(-20001, '你输入的ID无效!');
10. end get_empname;