20141109--SQL 练习题-1

create database xinxiku
go
use xinxiku
go
create table Student
(
    Sno char(3) primary key,
    Sname char(8) not null,
    Ssex char(2) not null,
    Sbirthday date ,
    Class char(5) 
)
go
create table Teacher
(
    Tno char(3) primary key,
    Tname char(4) not null,
    Tsex char(2) not null,
    Tbirthday date ,
    Prof char(6),
    Depart varchar(10) not null
)
go
create table Course
(
    Cno char(5) primary key,
    Cname varchar(10) not null,
    Tno  char(3) references [dbo].[Teacher]([Tno]) not null
)
go
create table Score
(
    Sno char(3) references [dbo].[Student]([Sno]) ,
    Cno char(5) references [dbo].[Course]([Cno]) ,
    primary key (Sno,Cno),
    Degree decimal(4,1) 
)
go
--------------------Student------------------
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')
-------------Teacher--------------
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')
-----------------course---------------------
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')
------------------Score--------------------
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')


--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 Ssex='女' or Class='95031'
--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 Sno=(select Sno from Score where Degree=(select MAX(degree)from Score))
--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 in( select Cno from Score group by Cno having count(*)>=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>70 and Degree<90
--14、查询所有学生的Sname、Cno和Degree列。
select Sname,Cno,Degree from Student,Score where Student.Sno=Score.Sno 
--15、查询所有学生的Sno、Cname和Degree列。
select Sno,Cname,Degree from Score,Course where Score.Cno=Course.Cno
--16、查询所有学生的Sname、Cname和Degree列。
select Sname,Cname,Degree from Student,Score,Course where Score.Sno=Student.Sno and Score.Cno=Course.Cno
--17、 查询“95033”班学生的平均分。
select AVG(Degree) from Score where Sno in (select Sno from Student 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')
select *from grade
--现查询所有同学的Sno、Cno和rank列。
select Sno,Cno,Degree,[rank] from Score,grade where Degree between low and upp order by Degree
--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 Student where Sno in(select Sno from Score where 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 as a where sno in
(
    select sno from score as b group by sno having COUNT(*)>1 
)
and
degree <
(
    select MAX(degree) from score as c  where a.cno = c.cno group by cno
)
--select Sno from score where  (select COUNT(*)from Score group by Sno)>1
-------------
select * from score where Degree not in (select MAX(Degree) from Score group by 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 Degree>(select Degree from Score where Cno='3-105' and 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 Sno,Sname,Sbirthday from Student where Sbirthday like (select DATENAME(YEAR,(select 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=(--查询教师姓名
select Tno from Course where Cno=(--查询教师编号
select Cno from Score group by Cno having COUNT(*)>5))--查询课程编号
--25、查询95033班和95031班全体学生的记录。
select *from Student where Class in ('95033','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--去重
--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 group by prof having COUNT(*)>1
)and Depart in('计算机系','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 * from Score where Degree>(select MAX(Degree) from Score where Cno='3-245') and Cno='3-105' 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 Degree>(select MAX(Degree) from Score where Cno='3-245') and Cno='3-105'
--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 as a where a.degree<
(
    select AVG(degree) from score as b where a.cno = b.cno  group by cno
)
select * from score as a where a.degree<(
    select AVG(degree) from score as b  group by cno having a.cno = b.cno
    )

select * from Score where Degree <any(select AVG(Degree) from Score group by Cno)
--select Degree from Score where Cno=     Degree <(select AVG(Degree) from Score group by 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)
--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 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,nianling=(select DATEDIFF(YEAR,Sbirthday,GETDATE())) from Student
--39、查询Student表中最大和最小的Sbirthday日期值。
select max(Sbirthday)as [max],MIN(Sbirthday) as[min] 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
--41、查询“男”教师及其所上的课程。
select Teacher.Tno,Tname,Tsex,Cname,Cno from Teacher  join Course on Teacher.Tno=Course.Tno where 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 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')
---------------------------------
select *from Teacher--教师信息
select *from Course--课程信息
select *from Score--分数，课程
select *from Student--学生信息
----------------------------------
--33、 查询成绩比该课程平均成绩低的同学的成绩表。
select AVG(Degree) from Score group by Cno
select Cno from Score group by Cno