create table Student
(
Sno char(3) primary key,
Sname char(8) not null,
Ssex char(2) not null,
Sbirthday datetime,
Class char(5)
);
create table Course
(
Cno varchar(10) primary key,
Cname varchar(10) not null,
Tno char(3) references Teacher(Tno)
);
drop table Course;
create table Score
(
Sno varchar(10) references Student(Sno),
Cno char(5) references Course(Cno),
Degree decimal(4,1)
);
drop table Score;
create table Teacher
(
Tno char(3) primary key,
Tname char(4) not null,
Tsex char(2) not null,
Tbirthday datetime,
Prof char(6),
Depart varchar(10) not null
);
drop table Teather;
truncate table 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);
truncate table 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','高等代数',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);
truncate table Score;
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 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=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;
--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(*) 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‘3-105’号课程的平均分。
select AVG(Degree) from Score where Cno='3-105'
--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 group by Cno having count(cno)>=5 and Cno like '3%'
--13、 查询最低分大于70，最高分小于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 Score s1,Student s2 where s1.Sno=s2.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 Score s1,Course c,Student s2 where s1.Sno=s2.Sno and s1.Cno=c.Cno;
--17、 查询“95033”班所选课程的平均分。
select AVG(Degree)from Score ,Student where Student.Class='95033'and Student.Sno =Score.Sno;
select AVG(Degree) from Score where Sno in (select Sno from Student where Class='95033')
--18、 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')
--19、 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 s1 where Degree<(select max(Degree) from Score s2 where s1.Sno=s2.Sno )
select * from Score s1 where Degree not in (select max(Degree) from Score s2 where s1.Cno=s2.Cno )and Sno in (select Sno from Score group by Sno having COUNT(*)>1)
--20、 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 Degree from Score where Score.Cno=(select Cno from Course where Course.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 t,Course c where t.Tno =c.Tno and c.Cno in (select Cno from Score group by Cno having COUNT(*) >5)
select Tname from Teacher inner join Course on Teacher.Tno=Course.Tno and Course.Cno = (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 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
--27、查询出“计算机系“教师所教课程的成绩表。
select Degree from Score s,Course c where c.Tno in (select Tno from Teacher where Depart='计算机系')and c.Cno=s.Cno;
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 in (select Prof from Teacher where Depart in('计算机系','电子工程系') group by Prof )
select Tname,Prof from Teacher where Prof not in (select Prof from Teacher where Depart ='电子工程系' and Prof in
(select Prof from Teacher where Depart = '计算机系')) 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 Cno,Sno,Degree from Score where Cno='3-105' and Degree>(select min(Degree) from Score where Cno='3-245')order by Degree desc
select Cno,Sno,Degree 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 Cno,Sno,Degree from Score where Cno='3-105' and Degree>(select max(Degree) from Score where Cno='3-245')
select Cno,Sno,Degree 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 name,Ssex sex,Sbirthday birthday 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 name,Ssex sex,Sbirthday birthday 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 < any (select AVG(Degree)from Score group by Cno)
select * from Score s1 where Degree < (select avg(Degree) from Score s2 where s1.cno=s2.cno)
--34、查询所有任课教师的Tname和Depart.
select Tname,Depart from Teacher t,Course c where t.Tno=c.Tno and c.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 t,Course c where t.Tno=c.Tno and c.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 (select COUNT(*) from Student where Ssex='男' )>=2 group by Class
--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,(YEAR(GETDATE())-YEAR(Sbirthday )) age 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 *,datediff(YEAR ,Sbirthday,getdate()) age from Student order by Class desc,age desc
select * from Student order by Class desc ,Sbirthday asc
--41、查询“男”教师及其所上的课程。
select Tname,Cname from Teacher inner 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 in (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 in (select Ssex from Student where Sname ='李军')and 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')and 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')