create database kaoshi

go

use kaoshi

go

create table Student

(

 Sn char(3) primary key,

 Sname char(8),

 Ssex char(2),

 Sbirthday datetime,

 class char(5),

 )

 create table Course

 (

 Cno char(5) primary key,

 Cname varchar(10),

 Tno char(3),

 )

 create table Score

 (

 Sno char(3),

 Cno char(5),

 Degree Decimal(4,1),

 )

 create table Teacher

 (

 Tno Char(3) primary key,

 Tname Char(4),

 Tsex Char(2),

 Tbirthday    datetime,

 Prof    Char(6),

 Depart    Varchar(10),

 )

 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 Course values(3-105,'计算机导论',825)

 insert into Course values(3-245,'操作系统',804)

 insert into Course values(6-166,'数字电路',856)

 insert into Course 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',1972-05-05,'助教','计算机系')

 insert into Teacher values(831,'刘冰','女',1977-08-14,'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 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 in(85,86,88)

--6、 查询Student表中“95031”班或性别为“女”的同学记录。

 select *from Student where class=95031

 select *from Student where 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 Sno,Cno from score where Degree=(select MAX(Degree) from score)

--11、 查询每门课的平均成绩。

 select avg(Degree) from Score where Cno='3-245'

 select avg(Degree) from Score where Cno='3-105'

 select avg(Degree) 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 Cno,avg(Degree) from score where Cno like '3%' group by Cno having count(Sno)>=5

--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,Degree from Student join Score on Student.Sn= Score.Sno

--15、查询所有学生的Sno、Cname和Degree列。

 select Sno,Degree,Cname from Score join Course on Score.Cno=Course.Cno

--16、查询所有学生的Sname、Cname和Degree列。

 select Sname,Cname,Degree from score join student on Score.Sno=Student.Sn join Course on Score.Cno=Course.Cno

--17、 查询“95033”班学生的平均分。

 select * from Student where class=95033 select AVG(Degree) from Score

--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,grade where Score.Degree between low and 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 Sno=''and Cno='3-105')

--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 where sno in (select sno from score group by sno having count(*)>1) and degree <(select max(degree) from score )

--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=''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 datediff(year,sbirthday,getdate())=(select datediff(year,sbirthday,getdate()) from student where sno='')

--23、查询“张旭“教师任课的学生成绩。

  select * from Score where Cno in(select Cno from Course where Tno in(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 in (select Tno from Course 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 in('','')

--26、  查询存在有85分以上成绩的课程Cno.

  select 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 * 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 depart='计算机系' and prof not in (select prof from teacher where depart='电子工程系')

  union

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

--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 * from Score where Cno='3-105' and Degree>any (select 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 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 Tname,Tsex,Tbirthday from Teacher

  union

  select Sname,Ssex,Sbirthday from Student

--32、查询所有“女”教师和“女”同学的name、sex和birthday.

  select Tname,Tsex,Tbirthday from Teacher where Tsex='女'

  union

  select Sname,Ssex,Sbirthday from Student where Ssex='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 where Degree<(select avg(Degree) from Score)

--34、 查询所有任课教师的Tname和Depart.

 select Tname,Depart from Teacher,Course where Teacher.Tno=Course.Tno

--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 distinct cno from score))

--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 as 姓名,datediff(year,sbirthday,getdate()) as 年龄 from student

--39、查询Student表中最大和最小的Sbirthday日期值。

 select Sname,Sbirthday as 大 from Student where Sbirthday =(select min(Sbirthday) from Student)

 union

 select Sname,Sbirthday as 小 from Student where Sbirthday =(select max(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 class,Sname,Sbirthday from Student order by class desc,Sbirthday;

--41、查询“男”教师及其所上的课程。

 select Tname,Cname from Teacher ,Course  where Teacher.Tno=Course.Tno and Tsex='男'

--42、查询最高分同学的Sno、Cno和Degree列。

 select * from Score where Degree=(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 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 Score where Sno in(select Sno from Student where Ssex='男') and Cno=(select Cno from Course where Cname='计算机导论')