创建学生表
create table Student
(
Sno varchar(20) not null primary key,
Sname varchar(20) not null,
Ssex varchar(20) not null,
Sbirthday datetime,
Class varchar(20)
)
创建教师表
create table Teacher
(
Tno varchar(20) not null primary key,
Tname varchar(20) not null,
Tsex varchar(20) not null,
Tbirthday datetime,
Prof varchar(20),
Depart varchar(20) not null
)
创建课程表
create table Course
(
Cno varchar(20) not null primary key,
Cname varchar(20) not null,
Tno varchar(20) not null,
foreign key(Tno) references Teacher(Tno)
)
创建成绩表
create table Score
(
Sno varchar(20) not null,
foreign key (Sno) references Student(Sno),
Cno varchar(20) not null,
foreign key (Cno) references Course (Cno),
Degree Decimal(4,1),
primary key(Sno,Cno)
)
录入Student 信息
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')
录入Teacher 信息
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','李冰','女','1977-08-14','助教','电子工程系');
录入Course 信息
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');
录入Score 信息
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
select distinct Depart from Teacher
3、 查询Student表的所有记录。
select * from Student
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 >= 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
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'
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
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
select * from Score order by Cno , Degree desc
9、 查询“95031”班的学生人数。
select count(class) from Student where class = '95031'
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)
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) from Score group by Cno
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 group by Cno having count(*)>5 and Cno like '3%'
select avg(Degree) from Score where Cno in (select * from Score group by Cno having count(*) > 5) and Cno like '3%' group by Cno
select 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 Sno from Score where Degree > 70 and Degree < 90
select Sno from Score where Degree between 70 and 90
14、查询所有学生的Sname、Cno和Degree列。
select Student.Sname , Score.Cno , Score.Degree from Student , Score where Student.Sno = Score.Sno
select Sname , Cno , Degree from Score join Student on Student.Sno = Score.Sno
15、查询所有学生的Sno、Cname和Degree列。
select Student.Sno , Course.Cname , Score.Degree from Student , Course , Score where Student.Sno = Score.sno and Course.Cno = Score.Cno
select Sno , Cname , Degree from Score join Course on Score.Cno = Course.Cno
16、查询所有学生的Sname、Cname和Degree列。
select Student.Sname , Course.Cname , Score.Degree from Student , Course , Score where Student.Sno = Score.sno and Course.Cno = Score.Cno
select Sname , Cname ,Degree from Score join Student on Student.Sno = Score.Sno join Course on Score.Cno = Course.Cno
17、 查询“95033”班学生的平均分。
select Cno,avg(Degree) from Student,Score where Student.Class = '95033' group by Cno
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：
creat table grade (low int(3) , upp int(3), 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。
select Student.Sno , Score.Cno , grade.rank from Student , Score , grade where Score.Sno = Student.Sno
select Sno , Cno , rank from Score join grade on Score.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 Student where Sno in (select Sno from Score where Cno = '3-105' and Degree >(select Degree from Score where Sno = '109' and Cno = '3-105') )
select * from Scroe where Cno = '3-105' ande 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 a where Sno in (select Sno from Score group by Sno having count(*) > 1) and Degree not in (select max(Degree) from Score b where b.Cno = a.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 Student where Sno in (select Sno from Score where Cno = '3-105' and Degree >(select Degree from Score where Sno = '109' and Cno = '3-105') )
select * from Score where Degree > (select * 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')
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 Cno = (select Cno from Course where Tno = (select Tno from Teacher where Tname = '张旭'))
select Degree from Score where Cno in (select Cno from Course where Tno = (select * 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))
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' or class = '95031'
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 Cno from Score where Degree > 85
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 where Cno in (select Cno from Course where Tno in (select Tno from Teacher where Depart = '计算机系'))
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
select Tname , prof from Teacher where prof not in (select prof from Teacher where depart = '计算机系' and prof in (select 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 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 * from Score where Cno = '3-105' and Degree >any(select Degree from Score where Cno = '3-245') order by Degree desc // any 列表中的任意一个
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 * from Score where Cno = '3-105' and Degree >all(select Degree from Score where Cno = '3-245') //all 列表中的所有
31、 查询所有教师和同学的name、sex和birthday.
select Tname , Tsex , Tbirthday from Teacher
union
select Sname , Ssex , Sbirthday from Student
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 Tname , Tsex , Tbirthday from Teacher where Tsex = '女'
union
select Sname , Ssex , Sbirthday from Student where Ssex = '女'
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 Degree from Score a where Degree < (select avg(Degree) from Score b where b.Cno = a.Cno)
select * from Score a where Degree < (select avg(Degree) from Score b where b.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)
select Tname , Depart from Teacher where Tno in (select Tno from Course)
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 not in (select Tno from Course)
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 group by class having count(Ssex = '男') >2
select Class from Student where Ssex = '男' group by Class having count(*) > 1
37、查询Student表中不姓“王”的同学记录。
select * from Student where Sname not like '王%'
select * from Student wher Sno not in (select Sno from Student weher Sname like '王%')
38、查询Student表中每个学生的姓名和年龄。
select DATEDIFF(yy,Sbirthday,2016-2-16)from Student
select Sname,YEAR(now())-YEAR(Sbirthday) 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
select max(Sbirthday) from Student union
select 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
select * from Student order by Class desc , Sbirthday
41、查询“男”教师及其所上的课程。
select Teacher.* , Course.Cname from Teacher , Course where Tsex = '男' and Teacher.Tno = Course.Tno
select * from Teacher join Course on Teacher.Tno = Course.Tno where Teacher.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)
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')
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')
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 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 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')