SQL数据库查询练习题

一、            设有一数据库，包括四个表：学生表（Student）、课程表（Course）、成绩表（Score）以及教师信息表（Teacher）。四个表的结构分别如表1-1的表（一）~表（四）所示，数据如表1-2的表（一）~表（四）所示。用SQL语句创建四个表并完成相关题目。

表1-1数据库的表结构

表（一）Student (学生表)

表（二）Course（课程表）

表（三）Score(成绩表)

表（四）Teacher(教师表)

表1-2数据库中的数据

表（一）Student

表（二）Course

表（三）Score

表（四）Teacher

1、 查询Student表中的所有记录的Sname、Ssex和Class列。

select Sname,Ssex,Class from Student

2、 查询教师所有的单位即不重复的Depart列。

select distinct Depart from teacher

3、 查询Student表的所有记录。

select * from student

4、 查询Score表中成绩在60到80之间的所有记录。

select * from Score where Degree between 60 and 80

5、 查询Score表中成绩为85，86或88的记录。

select * from Score where Degree=85 or Degree=86 or Degree=88

6、 查询Student表中“95031”班或性别为“女”的同学记录。

select * from student where Class=‘95031‘ or Ssex=‘女‘

7、 以Class降序查询Student表的所有记录。

select * from student order by Class desc

8、 以Cno升序、Degree降序查询Score表的所有记录。

select * from Score order by cno asc ,Degree desc

9、 查询“95031”班的学生人数。

select count(*) from student where class=‘95031‘

10、 查询Score表中的最高分的学生学号和课程号。（子查询或者排序）

select Cno,sno from Score where degree in (select MAX(Degree)from Score)

11、 查询每门课的平均成绩。

select avg(degree), cno from Score group by cno

12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。

select AVG(Degree) from Score group by cno having count(cno)>5 and Cno like ‘3%‘

13、查询分数大于70，小于90的Sno列。

Select Sno from Score where Degree between 70 and 90

14、查询所有学生的Sname、Cno和Degree列。

select Sname,Cno,Degree from Student join Score on Student.Sno=Score.Sno

15、查询所有学生的Sno、Cname和Degree列。

select Cname,Sno,Degree from course join Score on course.cno=Score.cno

16、查询所有学生的Sname、Cname和Degree列。

select Cname,Sname,Degree from course , Score ,Student where Student.Sno=Score.Sno andCourse.cno=Score.Cno

17、 查询“95033”班学生的平均分。

select avg(degree) from score,student where score.sno=student.sno and class=‘95033‘

18、 假设使用如下命令建立了一个grade表：

create table grade(low int(3),upp int(3),rank char(1))

insert into grade values(90,100,’A’)

insert into grade values(80,89,’B’)

insert into grade values(70,79,’C’)

insert into grade values(60,69,’D’)

insert into grade values(0,59,’E’)

现查询所有同学的Sno、Cno和rank列。

Select sno,cno,[rank] from score join grade on score.Degree between grade.low and grade.upp

19、  查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。

select * from Score where cno=‘3-105‘ and Degree>(select degree from Score where cno=‘3-105‘ and Sno=‘109‘)

20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。

select * from score a where sno in (Select sno from score group by sno having count(sno)>1) and degree<(select max(degree) from score b where b.cno=a.cno)

21、 查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。

select * from Score where cno=‘3-105‘ and Degree>(select degree from Score where Sno=‘109‘ and cno=‘3-105‘)

22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。

select Sno,Sname,Sbirthday from Student where YEAR(Sbirthday)=(select YEAR(sbirthday)from Student where Sno=‘108‘)

23、查询“张旭“教师任课的学生成绩。

Select Degree from score where cno=( Select cno from course where tno=(Select tno from teacher where tname=‘张旭‘))

24、查询选修某课程的同学人数多于5人的教师姓名。

Select tname from teacher where Tno=(select Tno from Course where Cno=(select Cno from Score group by Cno having COUNT(*)>5))

25、查询95033班和95031班全体学生的记录。

select * from Student where Class=‘95033‘ or Class=‘95031‘

26、  查询存在有85分以上成绩的课程Cno.

select distinct cno from score where Degree>85

27、查询出“计算机系“教师所教课程的成绩表。

select degree from score where Cno in(select cno from Course where Tno in(select tno from Teacher where Depart=‘计算机系‘))

28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。

select Tname,Prof from teacher where prof not in (select prof from teacher where depart = ‘计算机系‘and prof in (select prof from teacher where depart =‘电子工程系‘))

29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。

select Cno,Sno,Degree from Score where Cno=‘3-105‘ and Degree>(select MAX(degree)from Score where Cno=‘3-245‘) order by Degree desc

30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.

select Cno,Sno,Degree from Score where Cno=‘3-105‘ and Degree>(select MAX(degree)from Score where Cno=‘3-245‘)

31、 查询所有教师和同学的name、sex和birthday.

select sname as name,ssex as sex,sbirthday as birthday from Student

union

select tname ,tsex ,tbirthday from teacher

32、查询所有“女”教师和“女”同学的name、sex和birthday.

select sname as name,ssex as sex,sbirthday as birthday from Student where Ssex=‘女‘

union

select tname ,tsex ,tbirthday from teacher where tsex=‘女‘

33、 查询成绩比该课程平均成绩低的同学的成绩表。

Select degree from score a where degree<(select avg(degree) from score b where a.cno=b.cno)

34、 查询所有任课教师的Tname和Depart.

Select tname,depart from teacher where tno in (select tno from course where cno in (select cno from score group by cno))

35 、 查询所有未讲课的教师的Tname和Depart.

Select tname,depart from teacher where tno not in (select tno from course where cno in (select cno from score group by cno))

36、查询至少有2名男生的班号。

Select class from student where ssex=‘男‘group by class having count(*)>=2

37、查询Student表中不姓“王”的同学记录。

select * from student where sname not like ‘王%‘

38、查询Student表中每个学生的姓名和年龄。

Select sname,YEAR(GETDATE())-YEAR(sbirthday) as‘年龄‘ from student

39、查询Student表中最大和最小的Sbirthday日期值。

select MAX(Sbirthday),MIN(Sbirthday) from Student

40、以班号和年龄从大到小的顺序查询Student表中的全部记录。

select * from Student order by Class desc, Sbirthday ASC

41、查询“男”教师及其所上的课程。

Select tname,cname from teacher join course on teacher.tno=course.tno and teacher.tsex=‘男‘

42、查询最高分同学的Sno、Cno和Degree列。

select Sno,Cno,Degree from Score where Degree in(select MAX(Degree) from Score)

43、查询和“李军”同性别的所有同学的Sname.

Select sname from student where ssex=(select ssex from student where sname=‘李军‘)

44、查询和“李军”同性别并同班的同学Sname.

Select sname from student where ssex=(select ssex from student where sname=‘李军‘) and Class=(select class from student wheresname=‘李军‘)

45、查询所有选修“计算机导论”课程的“男”同学的成绩表。

select degree from Score where Sno in(select Sno from Student where Ssex=‘男‘)and Cno in (select Cno from Course where cname=‘计算机导论‘)