--创建数据库
create database zuoye
--使用数据库
use zuoye
--创建第一个表Student 学生表
create table Student
(
sno Char(3) not null primary key, --学号
sname Char(8) not null, --学生姓名
ssex Char(2) not null, --学生性别
sbirthday datetime , --学生出生年月
class Char(5) --学生所在班级
)
--创建第二个表 Course（课程表）
create table Course
(
cno Char(5) not null primary key, --课程号
cname varchar(10) not null, --课程名称
tno char(3) not null references Teacher (tno) --教工编号
)
--创建第三个表Score(成绩表)
create table Score
(
sno char(3) not null references Student(sno), --学号
cno char(5) not null references Course(cno), --课程号
degree decimal(4,1) --成绩
primary key(sno,cno)
)
--创建第四个表Teacher(教师表)
create table Teacher
(
tno char(3) not null primary key, --教工编号
tname char(4) not null, --教工姓名
tsex char(2) not null, --教工性别
tbirthday datetime, --教工出生年月
prof char(6), --职称
depart varchar(10) not null --教工所在部门
)
select *from Student
drop table Student
drop table Course
drop table Score
drop table Teacher
--往第一表中添加数据
select *from 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')
--往第二表中添加数据
select *from 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')
--往第三个表添加数据
select *from 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')
--往第四个表添加数据
select *from 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')
select *from Student select *from Course select *from Score select *from Teacher
--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>=60 and degree <=80)
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=85 or degree=86 or 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 --desc 是降序 asc升序
--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 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 cno,AVG(DEGREE)as pingjun 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 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 left 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 Course left join Score on Course.cno=Score.cno
select student.sno,cname,degree from student join score on student.sno = score.sno join course on score.cno = course.cno
--16、查询所有学生的Sname、Cname和Degree列
select sname,(select cname from course where Course.cno=Score.cno) as cname,degree from Student join Score on student.sno=score.sno
--17、查询“95033”班学生的平均分
select AVG(degree) as 平均分 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
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
select sno,cno,(select RANK from grade where DEGREE<=upp and DEGREE>=low) as rank 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 cno,degree,(select sname from Student where Student.sno=Score.sno)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 sno in(select sno from Score group by sno having COUNT(*)>1) and degree !=(select MAX(degree)from Score) order by degree desc
select *from Score as a where sno in( select sno from Score group by sno having COUNT(*)>1) and a.degree !=(select MAX(degree)from Score as b where b.cno=a.cno)
--查询不是这一门课最高分的所有数据
select *from Score as a where a.DEGREE != (select MAX(degree)from Score as b where a.cno=b.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 DEGREE,cno,sno,(select sname from Student where Score.sno=Student.sno)as sname from Score where sno=109 and cno='3-105'
--22、查询学号为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 (CAST(YEAR(sbirthday) as varchar(10)))=(select CAST(YEAR(sbirthday) as varchar(10)) as time 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=(select tno from Course where cno=(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 Student.sno,sname,cno,degree from Student join Score on Student.sno=Score.sno where class='95033'or class='95031'
--26、 查询存在有85分以上成绩的课程Cno.
select cno from Score where DEGREE>85 group by cno
--27、查询出“计算机系“教师所教课程的成绩表。
select degree,cno 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
--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')
--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 as a where sno in ( select sno from Score where cno ='3-105' or cno='3-245' group by sno having COUNT(*)>=2) and cno='3-105' and DEGREE >(select DEGREE from Score where cno='3-245' and sno=a.sno)
--31、 查询所有教师和同学的name、sex和birthday.
select tname as name, tsex as sex,tbirthday as birthday 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 as name, tsex as sex,tbirthday as birthday 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 as a where degree<(select avg(degree) from Score where cno=a.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 ))
--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(ssex)>=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,(DATEPART(YEAR,GETDATE())- CAST(YEAR(Sbirthday)as int))as 年龄 from Student
--39、查询Student表中最大和最小的Sbirthday日期值。
select MAX(Sbirthday) as 最小,MIN(Sbirthday) as 最大 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 cno,cname,(select tname from Teacher where Teacher.tno=Course.tno)as 教师 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 top 1 * from Score order by degree desc
--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 in(select cno from Course where cname='计算机导论')
--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) order by degree desc
select *from Score as a where sno in( select sno from Score group by sno having COUNT(*)>1) and a.degree !=(select MAX(degree)from Score as b where b.cno=a.cno)
--查询不是这一门课最高分的所有数据
select *from Score as a where a.DEGREE != (select MAX(degree)from Score as b where a.cno=b.cno )