SQL测试

create database Text
go

use Text
go

--创建学生表
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)
)
go

--向表student插入数据
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','1977-09-01','95033')
insert into Student values ('109','王芳','女','1977-09-01','95031')
insert into Student values ('103','陆君','男','1977-09-01','95031')

--创建课程表
create table Course
(
    Cno char(5) not null primary key,
    Cname varchar(10) not null,
    Tno char(3) not null references Teacher (Tno)
)
go

--向Course插入数据
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')


--创建分数表
create table Score
(
    Sno char(3) not null references Student (Sno),
    Cno char(5) not null references Course (Cno),
    Degree decimal (4,1)
    )
go

--向Score插入数据
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)


--创建教师表
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

--向Teacher插入数据
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')
go



--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。
--方法1:
select * from Score where Degree>60 and Degree<80      
--方法2：
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。
--方法1:
select * from Score where Degree=85 or Degree=86 or Degree=88  
--方法2：
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 [95031班级人数]=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）
--方法1:
select top 1 Sno,Cno from Score order by Degree desc   -
--方法2: 
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) as 平均成绩,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 [课程]=Cno, [平均分]=AVG(Degree) from Score where Cno like '3%' group by Cno having count(*)>=5

--13、查询分数大于70，小于90的Sno列。
select * from Score where Degree>70  and Degree<90

--14、查询所有学生的Sname、Cno和Degree列。
--方法1:
select Sname,Cno,Degree from Student ,Score where Score.Sno=Student.Sno
--方法2:
    select sname,cno,DEGREE from score
    inner join student on Score.Sno=student.Sno

--15、查询所有学生的Sno、Cname和Degree列。
select Sno,Degree,Cname 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 
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 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')
                --现查询所有同学的Sno、Cno和rank列。
                --方法1:
                select sno,cno,rank from Score join grade on Degree between low and upp order by rank
                --方法2:
                select sno,cno, (select RANK from grade where score.degree between low and upp) as 级别 from score
                
--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。
--1.查询学号出现两次及以上的学号出来
select sno from Score group by Sno having COUNT(*)>=2
--2.查询步骤1中的学号的人的分数
select *from Score where Sno in (select sno from Score group by Sno having COUNT(*)>=2)
--3.查询所有人的分数最高分出来
select max(degree) from Score where Sno in (select sno from Score group by Sno having COUNT(*)>=2)
--4.从步骤2的结果中剔除最高分即步骤3的
select *from Score where Sno in (
select sno from Score group by Sno having COUNT(*)>=2
)
 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 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=
(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 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='95033'
union all
select * from Student where Class='95031'

--26、  查询存在有85分以上成绩的课程Cno.
select Cno from Course where Tno in
(select Tno 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 where Depart='计算机系'
select Tname,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 *from score where cno='3-105' and degree>
(select MAX(degree) from score where cno='3-245') 
order by degree desc

--31、 查询所有教师和同学的name、sex和birthday.
select Sname,Ssex,Sbirthday from Student
union all
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 all
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 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 where Tno in
(select Tno from Course where Cno in
(select distinct 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 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 Sname 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,convert (int, datediff (DAY,Sbirthday,GETDATE())/365) as Sage from Student

--39、查询Student表中最大和最小的Sbirthday日期值。
select 最大生日=MAX(Sbirthday),最小生日=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 desc

--41、查询“男”教师及其所上的课程。
select Cno 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 Sno,Cno,Degree 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')