SQL server 45题

use mydb
create table Student
(
    Sno char(3) not null primary key,
    Sname char(8) not null,
    Ssex char(2) not null,
    Sbirthday datetime,
    Class char(5)
)
create table Teacher
(
    Tno char(3) not null primary key,
    Tname char(4) not null,
    Tsex char(2) not null,
    Tbirthday datetime,
    Prof char(6),
    Depart varchar(10) not null
)
go
create table Course
(
    Cno char(5) not null primary key,
    Cname varchar(10) not null,
    Tno char(3) not null references Teacher(Tno)
)
go
create table Score
(
    Sno char(3) not null references Student(Sno),
    Cno char(5) not null references Course(Cno),
    Degree Decimal(4,1),
    primary key(Sno,Cno)
)

--向学生表添加数据
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‘)
select * from Student
--向教师表添加数据
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‘)
select * from Teacher
--向课程表中添加数据
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‘)
select * from Course
--向成绩表添加数据
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)
select * from Score

--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 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‘ 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(1) 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
)
select top 1 Sno,Cno from Score order by Degree desc --排序

--11、 查询每门课的平均成绩。
select Cno,AVG(Degree) 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 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 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 Sno,Cname,Degree from Score join Course on Course.Cno=Score.Cno

--16、查询所有学生的Sname、Cname和Degree列
select Sname,Cname,Degree from Student join Score on Student.Sno=Score.Sno join Course on Course.Cno=Score.Cno

--17、查询“95033”班学生的平均分
select AVG(Degree) from Score join Student on Student.Sno=Score.Sno where Class=‘95033‘

--18、 假设使用如下命令建立了一个grade表：
       --现查询所有同学的Sno、Cno和rank列。
select Sno,Cno,rank from Score join grade on 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=‘109‘ 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 Degree not in(
select MAX(Degree) from Score
) and Sno in (
select Sno from Score group by Sno having COUNT(*)>1
)

--21、查询成绩高于学号为“109”并且课程号为“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 * 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(Cno)>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 in(
select Degree 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 t1 where Depart=‘计算机系‘ and Prof not in(
select Prof from Teacher t2 where Depart=‘电子工程系‘
)
union
select Tname,Prof from Teacher t1 where Depart=‘电子工程系‘ and Prof not in(
select Prof from Teacher t2 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”的一个同学成绩的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”课程的所有同学成绩的Cno、Sno和Degree

select * from Score where Cno=‘3-105‘ and Degree>All(
select Degree from Score where Cno=‘3-245‘
)
--31、 查询所有教师和同学的name、sex和birthday.

select Sname,Ssex,Sbirthday 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,Ssex,Sbirthday 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 * from Score s1 where Degree<(
select AVG(Degree) from Score s2 group by Cno having s1.Cno=s2.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
)
)
--35 、查询所有未讲课的教师的Tname和Depart

select Tname,Depart from Teacher where Tno in(
select Tno from Course where Cno not in(
select 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 SUBSTRING(Sname,1,1) not in(‘王‘)

--38、查询Student表中每个学生的姓名和年龄

select sname as ‘姓名‘,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 Cname from Course where Tno in(
select Tno from Teacher where Tsex=‘男‘
)
--42、查询最高分同学的Sno、Cno和Degree列

select * from Score s1 where Degree in(  --各门课最高分的学生(3个)
select max(Degree) from Score s2 group by Cno having s1.Cno=s2.Cno
)

  --所有课程分数和最大的学生(1个)
select * from Score where sno in(
select top 1 sno from Score group by Sno Order by SUM(Degree) desc
)

--43、查询和“李军”同性别的所有同学的Sname.

select Sname from Student where Ssex in(
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 in(
select Ssex from Student where Sname=‘李军‘
) and Class in(
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 Cno in(
select Cno from Course where Cname=‘计算机导论‘
) and Sno in(
select Sno from Student where Ssex=‘男‘
)
--*******************************************************************

select * from Student
select * from Score
select * from Course
select * from Teacher