50个常用sql语句

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“”课程比“”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“”并且也学过编号“”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“”的成绩比课程编号“”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

9、查询所有课程成绩小于分的同学的学号、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“”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“”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“”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“”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\行\显示): 企业管理（），马克思（），OO&UML （），数据库（） 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 马克思平均分

,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 马克思及格百分数

,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（），马克思（），UML （），数据库（）

[学生ID],[学生姓名],企业管理,马克思,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 马克思, T3.score AS UML, T4.score AS 数据库, ISNULL(T1.score,0) + ISNULL(T4.score,0) as 总分

ISNULL(T2.score,0)

+

ISNULL(T3.score,0)

+

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(T4.score,0) NOT IN (SELECT

DISTINCT

TOP 15 WITH TIES ISNULL(T1.score,0) ISNULL(T4.score,0)

+

ISNULL(T2.score,0)

+

ISNULL(T3.score,0)

+

+

ISNULL(T3.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、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、查询课程编号为且课程成绩在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“”课程分数小于，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“”同学的“”课程的成绩 delete FROM Sc WHERE S#='001'and C#='001'

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http://blog.csdn.net/liangCK/archive/2008/10/08/3031558.aspx

上机实验二 参考答案------------------------------------------ --创建表

create table classInfo (

classID varchar(10) primary key, className varchar(50) not null, classDesc varchar(100) null )

create table studInfo (

studNo varchar(15) primary key, studName varchar(20) not null,

studSex char(2) check(studSex in('男','女')) not null, studBirthday DateTime null,

classID varchar(10) references classInfo(classID) not null )

create table teacherCourseInfo (

teacherNo varchar(10), courseID varchar(10),

primary key(teacherNo,courseID) )

create table courseInfo(

courseID varchar(10) primary key, courseName varchar(50) not null, courseDesc varchar(100) null )

create table teacherInfo(

teacherNo varchar(10) primary key, teacherName varchar(20) not null, teacherDesc varchar(100) null )

create table studSelectCourseInfo(

teacherNo varchar(10) references teacherInfo(teacherNo), courseID varchar(10) references courseInfo(courseID), primary key(teacherNo,courseID) )

create table studScoreInfo(

end return @s end

select dbo.GetSum(99)

--17 编写一个存储过程,存储过程名称为myProc,存储过程实现查询某个同学的平均分成绩信息.学号作为参数. (6分)

create proc myProc @studNo numeric(4,1) as begin

select studInfo.studNo,studName,studSex,classID,avg(studScore)avgscore from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo group by studInfo.studNo,studName,studSex,classID having studInfo.studNo=@studNo end

--18 在课程信息表上创建一个触发器,实现删除某门课程,则触发删除成绩信息表中该课程的成绩信息(级联删除) (6分) create trigger TcourseInfo on courseInfo for delete as

delete from studScoreInfo where courseID IN (select courseID from deleted )

1 查询学号为20050319001的学生信息(5分)

select * from studInfo where studNo='20050319001'

2 查询同名同姓的学生基本信息(5分)

select * from studInfo where studName in(

select studName from studInfo group by studName having count(*)>=2)

3 查询学生性别为?女?并且平均分大于80分的学生基本信息(5分) select studInfo.studNo,studName,studSex,studBirthday,classID from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo and studSex='女' group by studInfo.studNo,studName,studSex,studBirthday,classID having avg(studScore)>80

4 查询学生的姓名及学生的选课课程名称(5分)

select studName,courseName from studInfo,studScoreInfo,courseInfo where studInfo.studNo=studScoreInfo.studNo and courseInfo.courseId=studScoreInfo.courseID

5 查询电子信息工程2006级这个班级的同学的学生学号和姓名(5分) select studNo,studName,className from studInfo,classInfo where studInfo.classID=classInfo.classID and className='电子信息工程2006'

6 查询1985年11月11日以后出生的学生的学号和姓名(5分) select studNo,studName,studBirthday from studInfo where studBirthday>'1985-11-11'

7 查询选课门数在8门以上的学生的学号和姓名以及课程门数(5分) select studInfo.studNo,studName,count(*) courseCount from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo group by studInfo.studNo,studName having count(*)>8

8 查询郎梅同学各门课程的平均分和总分(5分)

select studName,avg(studScore) avgscore,sum(studScore) sumscore from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo and studName='郎梅' group by studName

9 查询学生姓名当中有个”丽”字的同学的学生基本信息(5分) select * from studInfo where studName like '%丽%'

10 查询平均分在60分以下或90分以上的同学的个人基本信息(5分) select studInfo.studNo,studName,studSex,studBirthday,classID from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo

group by studInfo.studNo,studName,studSex,studBirthday,classID having avg(studScore)<60 or avg(studScore)>90

11 查询课程班级人数少于20人的班级信息(5分) select classInfo.classID,className,classDesc from studInfo right join classInfo on studInfo.classID=classInfo.classID

group by classInfo.classID,className,classDesc having count(*)<20

12 统计各学生的平均分,如果课程门数大于20门,则去掉最高分和最低分求平均分,否则以所有课程求平均分.包括学号,总分,最高分,最低分,课程门数,平均分字段(5分) select studScoreInfo.studNo,studName,

sum(studScore) sumScore,max(studScore) maxScore, min(studScore) minScore,count(*) courseCount, avgScore=case

when

count(*)>20

then

(sum(studScore)-max(studScore)-min(studScore))/(count(*)-2) when count(*)<=20 then avg(studScore) end

from studScoreInfo,studInfo

where studScoreInfo.studNo=studInfo.studNo group by studScoreInfo.studNo,studName

13 使用IN子查询,查询学生平均成绩大于65小于80,并且课程门数在10以上的学生基本信息(5分)

select * from studInfo where studNo in( select studNo from studScoreInfo group by studNo

having avg(studScore)> 65 and avg(studScore)<80 and count(*)>10)

14 创建学号为20050319001的该名同学的平均分视图,包括学号,姓名,平均分字段(5分) create view avgscoreView as

select studInfo.studNo,studName,avg(studScore) avgscore from studInfo,studScoreInfo where

studInfo.studNo=studScoreInfo.studNo

and

studInfo.studNo='20050319001' group by studInfo.studNo,studName

15 T-SQL编程,如果成绩信息中有得100分的,则输出显示得100分的成绩信息,如果没有,则输出显示?没有考100分的?(5分)

if exists(select * from studScoreInfo where studscore=100) print '有得100分的' else

print '没有考100分的'

16 编写一个自定义函数,函数名为myJC,用于计算阶乘 (5分) create function myJC (@n int) returns bigint as begin

declare @i int,@k bigint set @i=1 set @k=1

while @i<=@n begin

set @k=@k*@i set @i=@i+1 end return @k end

17 编写一个存储过程,存储过程名称为myProc,存储过程实现查询两个成绩区间范围的学生成绩信息.两个成绩区间值作为参数. (6分)

create proc myProc @start numeric(4,1),@end numeric(4,1) as begin

select studInfo.studNo,studName,studSex,studBirthday,classID from studInfo,studScoreInfo

where studInfo.studNo=studScoreInfo.studNo

group by studInfo.studNo,studName,studSex,studBirthday,classID having avg(studScore)>=@start and avg(studScore)<=@end end

18 在班级信息表上创建一个触发器,实现删除某个班级,则触发删除学生信息表中该班级的学生信息(级联删除) (6分)

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