SQL 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

create database xsxksjb
go
create table student
(
Sno char(3) primary key not null,
Sname char(8)not null,
Ssex char(2)not null,
Sbirthday datetime,
Class char(5)
)
go
create table coures
(
Cno char(5) primary key not null,
Cname varchar(10)not null,
Tno char(3) references teacher(Tno)not null
)
go
create table score
(
Sno char(3) references student(Sno)not null,
Cno char(5) references coures(Cno) not null,
Degree decimal(4,1)
primary key(Sno,Cno)
)
go
create table teacher
(
Tno char(3) primary key not null,
Tname char(4)not null,
Tsex char(2)not null,
Tbirthday datetime,
Prof char(6),
Depart varchar(10)not null
)
go

insert into student values(‘108‘,‘曾华‘,‘男‘,‘1977-09-01‘,‘95033‘)
insert into student values(‘105‘,‘匡明‘,‘男‘,‘1975-10-02‘,‘95031‘)
insert into student values(‘107‘,‘王丽‘,‘女‘,‘1976-01-23‘,‘95033‘)
insert into student values(‘101‘,‘李军‘,‘男‘,‘1976-02-20‘,‘95033‘)
insert into student values(‘109‘,‘王芳‘,‘女‘,‘1975-02-10‘,‘95031‘)
insert into student values(‘103‘,‘陆君‘,‘男‘,‘1974-06-03‘,‘95031‘)

insert into coures values(‘3-105‘,‘计算机导论‘,‘825‘)
insert into coures values(‘3-245‘,‘操作系统‘,‘804‘)
insert into coures values(‘6-166‘,‘数字电路‘,‘865‘)
insert into coures values(‘9-888‘,‘高等数学‘,‘831‘)

insert into score values(‘103‘,‘3-245‘,‘86‘)
insert into score values(‘105‘,‘3-245‘,‘75‘)
insert into score values(‘109‘,‘3-245‘,‘68‘)
insert into score values(‘103‘,‘3-105‘,‘92‘)
insert into score values(‘105‘,‘3-105‘,‘88‘)
insert into score values(‘109‘,‘3-105‘,‘76‘)
insert into score values(‘101‘,‘3-105‘,‘64‘)
insert into score values(‘107‘,‘3-105‘,‘91‘)
insert into score values(‘108‘,‘3-105‘,‘78‘)
insert into score values(‘101‘,‘6-166‘,‘85‘)
insert into score values(‘107‘,‘6-166‘,‘79‘)
insert into score values(‘108‘,‘6-166‘,‘81‘)

insert into teacher values(‘804‘,‘李诚‘,‘男‘,‘1958-12-02‘,‘副教授‘,‘计算机系‘)
insert into teacher values(‘856‘,‘张旭‘,‘男‘,‘1969-03-12‘,‘讲师‘,‘电子工程系‘)
insert into teacher values(‘825‘,‘王萍‘,‘女‘,‘1958-12-02‘,‘助教‘,‘计算机系‘)
insert into teacher values(‘831‘,‘刘冰‘,‘女‘,‘1958-12-02‘,‘助教‘,‘电子工程系‘)

--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>60and Degree<8

--5、 查询Score表中成绩为85，86或88的记录。

select * from score where Degree=85or Degree=86or 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,Degree desc

--9、 查询“95031”班的学生人数。

select COUNT(*) 人数 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 top 1 Sno,Cno,Degree from score order by Degree desc

--11、 查询每门课的平均成绩。

select AVG(Degree) 操作系统平均分 from score where Cno=‘3-245‘
select AVG(Degree) 计算机导论均分 from score where Cno=‘3-105‘
select AVG(Degree) 数字电路平均分 from score where Cno=‘6-166‘

--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 where Cno like ‘3%‘---不完整

--13、查询分数大于70，小于90的Sno列。

select Sno from score where Degree>70 and Degree<90

--14、查询所有学生的Sname、Cno和Degree列。

select student.Sname,score.Cno,score.Degree from student,score where student.Sno=score.Sno

--15、查询所有学生的Sno、Cname和Degree列。

select score.Sno,coures.Cname,score.Degree from coures,score where coures.Cno=score.Cno

--16、查询所有学生的Sname、Cname和Degree列。

select student.Sname,coures.Cname,score.Degree from student,coures,score where student.Sno=score.Sno and coures.Cno=score.Cno

--17、 查询“95033”班学生的平均分。

select AVG(Degree)from student left join score on student.Sno=score.Sno where class="95033"

--18、 假设使用如下命令建立了一个grade表：
create table grade(low int,upp int,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 degree>grade.low and Degree<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 top 3* from score where Cno=‘3-105‘order by Degree desc

--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
select Sno from score group by Sno having COUNT(*)>1
select * from score where Sno in(‘101‘,‘103‘,‘105‘,‘107‘,‘108‘,‘109‘)
select MAX(Degree) from score
select sno from score where Degree=92
select sno from score where Sno in
(select Sno from score where Degree!=‘103‘group by Sno having COUNT(*)>1)
select * from score where Sno in(select Sno from score where Sno!=(select sno from score
where Degree=92)group by Sno having COUNT(*)>1)

--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>all(select Degree from score where Sno=109)

--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 student.Sno,student.Sname,student.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 score.degree from coures,score,teacher where coures.Cno=score.cno and teacher.tno=coures.Tno and teacher.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 * from teacher
select *from score
select * from coures
select Cno from score group by Cno having count(*)>=5
select Tno from coures where Cno in(‘3-105‘)
select Tname from teacher where Tno in(‘825‘)
select Tname from teacher where Tno in(select Tno from coures where Cno in(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,teacher,coures where coures.Cno=score.Cno and teacher.Tno=coures.Tno and
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

--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 * from score
select MAX(Degree)from score where Cno=‘3-245‘
select *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 * from score
select Sno from score where Cno in(‘3-105‘,‘3-245‘)group by Sno having COUNT(*)>=2
select sno from score s1 where Sno in(‘103‘,‘105‘,‘109‘)and Cno=‘3-105‘ and exists(
select * from score s2 where Sno in(‘103‘,‘105‘,‘109‘)and Cno=‘3-245‘ and s1.Sno=s2.Sno and s1.Degree>s2.Degree
)
select *from score where Sno in(select sno from score s1 where Sno in(select Sno from score where Cno in(‘3-105‘,‘3-245‘)group by Sno having COUNT(*)>=2)and Cno=‘3-105‘ and exists(
select * from score s2 where Sno in(select Sno from score where Cno in(‘3-105‘,‘3-245‘)group by Sno having COUNT(*)>=2)and Cno=‘3-245‘ and s1.Sno=s2.Sno and s1.Degree>s2.Degree
))
--找出即选105又选245的人的学号（使用分组查询），2找出105的成绩大于245的成绩的学生学号（使用相关子查询）
--3根据第二步差出学生的学号

--31、 查询所有教师和同学的name、sex和birthday.

select sname,ssex,sbirthday from student
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,ssex,sbirthday from student where Ssex=‘女‘
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 * from score s1 where exists(
select cno,AVG(degree) from score s2 group by Cno having s1.Cno=s2.Cno and s1.Degree<AVG(Degree))

--34、 查询所有任课教师的Tname和Depart.

select *from coures
select * from teacher where exists(select *from coures where teacher.Tno=coures.Tno)
select distinct Tno from coures
select *from teacher where Tno in(select distinct Tno from coures)
select teacher.Tname,teacher.Depart from teacher join coures on teacher.Tno=coures.Tno

--35 、 查询所有未讲课的教师的Tname和Depart.

select*from teacher
select*from course
select cno from score group by cno
select tname,depart from teacher course where tno=‘831‘

--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*from student
select sname ,(2015-YEAR(sbirthday)) from student

--39、查询Student表中最大和最小的Sbirthday日期值。

select MAX(Sbirthday) 最大日期值,MIN(Sbirthday) 最小日期值 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 ,Sbirthday

--41、查询“男”教师及其所上的课程。

select Tname,Cname from teacher,coures where Tsex=‘男‘ and coures.Tno=teacher.Tno

--42、查询最高分同学的Sno、Cno和Degree列。

select top 1*from score order by degree desc

select*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 * from student
select ssex from student where Sname=‘李军‘
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 * from student
select ssex from student where Sname=‘李军‘
select class from student where Sname=‘李军‘
select sname from student where Ssex=(select ssex from student where Sname=‘李军‘) and Class=(select class from student where Sname=‘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 * from coures
select * from score
select * from student
select sno from student where Ssex=‘男‘
select cno from coures where Cname=‘计算机导论‘
select degree from score,student,coures,teacher where student.Sno=score.Sno and coures.Cno=score.Cno and
teacher.Tno=coures.Tno and Ssex=‘男‘ and Cname=‘计算机导论‘