学业讲解和复习,MySQL查询语句实练习习

题目:新建一个数码库ClassManager,包罗八个表:学生表(Student)、课程表(Course)、成绩表(Score)以及老师音信表(Teacher)。三个表的协会分别如表1-1的表(一)~表(四)所示,数据如表1-2的表(一)~表(四)所示。用SQL语句创建四个表并已毕相关题材。

–率先题 查询Student表中的所有记录的Sname、Ssex和Class列。
select Sname,Ssex,Class from student

#创建表

–率先题 查询Student表中的所有记录的Sname、Ssex和Class列。
select Sname,Ssex,Class from student

一.表1-1数据库的表结构

表(一)Student (学生表) 

属性名

数据类型

可否为空

含 义

Sno

varchar (20)

学号

Sname

varchar (20)

学生姓名

Ssex

varchar (20)

学生性别

Sbirthday

datetime

学生出生年月

Class

varchar (20)

学生所在班级

 

表(二)Course(课程表)

属性名

数据类型

可否为空

含 义

Cno

varchar (20)

课程号

Cname

varchar (20)

课程名称

Tno

varchar (20)

教工编号

表(三)Score(成绩表)

属性名

数据类型

可否为空

含 义

Sno

varchar (20)

学号

Cno

varchar (20)

课程号

Degree

Decimal(4,1)

成绩

表(四)Teacher(教师表)

属性名

数据类型

可否为空

含 义

Tno

varchar (20)

教工编号

Tname

varchar (20)

教工姓名

Tsex

varchar (20)

教工性别

Tbirthday

datetime

教工出生年月

Prof

varchar (20)

职称

Depart

varchar (20)

教工所在部门

–次之题 查询助教所有的单位即不重复的Depart列。
select distinct Depart from Teacher

create table Student #学生表
(
Sno varchar(20) not null primary key,
Sname varchar(20) not null,
Ssex varchar(20) not null,
Sbirthday datetime,
Class varchar(20)
);

–次之题 查询教授所有的单位即不另行的Depart列。
select distinct Depart from Teacher

二.表1-2数据库中的数据

表(一)Student

Sno

Sname

Ssex

Sbirthday

class

108

曾华

1977-09-01

95033

105

匡明

1975-10-02

95031

107

王丽

1976-01-23

95033

101

李军

1976-02-20

95033

109

王芳

1975-02-10

95031

103

陆君

1974-06-03

95031

表(二)Course

Cno

Cname

Tno

3-105

计算机导论

825

3-245

操作系统

804

6-166

数字电路

856

9-888

高等数学

831

表(三)Score

Sno

Cno

Degree

103

3-245

86

105

3-245

75

109

3-245

68

103

3-105

92

105

3-105

88

109

3-105

76

101

3-105

64

107

3-105

91

108

3-105

78

101

6-166

85

107

6-166

79

108

6-166

81

表(四)Teacher

Tno

Tname

Tsex

Tbirthday

Prof

Depart

804

李诚

1958-12-02

副教授

计算机系

856

张旭

1969-03-12

讲师

电子工程系

825

王萍

1972-05-05

助教

计算机系

831

刘冰

1977-08-14

助教

电子工程系

–第三题 查询Student表的保有记录。
select * from student

create table Teacher #教师表
(
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
);

–第三题 查询Student表的享有记录。
select * from student

三.到位以下操作

0.按照上述题目和表格,创设相应数据库,成立相应表结构,并插入给定数据

create database ClassManager;
use ClassManager1;

create table student (
sno varchar(20) not null comment '学号',
sname varchar(20) not null comment '学生姓名',
ssex varchar(20) not null comment '学生性别',
sbirthday datetime comment '学生出生年月',
class varchar(20) comment '学生所在班级'
);

create table course (
cno varchar(20) not null comment '课程号',
cname varchar(20) not null comment '课程名称',
tno varchar(20) not null comment '教工编号'
);

create table score (
sno varchar(20) not null comment '学号',
cno varchar(20) not null comment '课程号',
degree decimal(4,1) comment '成绩'
);

create table teacher (
tno varchar(20) not null comment '教工编号',
tname varchar(20) not null comment '教工姓名',
tsex varchar(20) not null comment '教工性别',
tbirthday datetime comment '教工出生年月',
prof varchar(20) comment '职称',
depart varchar(20) not null comment '教工所在部门'
);

insert into student (sno, sname, ssex, sbirthday, class) values ('108',    '曾华','男','1977-09-01','95033');
insert into student (sno, sname, ssex, sbirthday, class) values ('105',    '匡明','男','1975-10-02','95031');
insert into student (sno, sname, ssex, sbirthday, class) values ('107',    '王丽','女','1976-01-23','95033');
insert into student (sno, sname, ssex, sbirthday, class) values ('101',    '李军','男','1976-02-20','95033');
insert into student (sno, sname, ssex, sbirthday, class) values ('109',    '王芳','女','1975-02-10','95031');
insert into student (sno, sname, ssex, sbirthday, class) values ('103',    '陆君','男','1974-06-03','95031');

insert into course (cno, cname, tno) values ('3-105', '计算机导论',  '825');
insert into course (cno, cname, tno) values ('3-245', '操作系统',    '804');
insert into course (cno, cname, tno) values ('6-166', '数字电路',    '856');
insert into course (cno, cname, tno) values ('9-888', '高等数学',    '831');

insert into score (sno, cno, degree) values ('103', '3-245', '86');
insert into score (sno, cno, degree) values ('105', '3-245', '75');
insert into score (sno, cno, degree) values ('109', '3-245', '68');
insert into score (sno, cno, degree) values ('103', '3-105', '92');
insert into score (sno, cno, degree) values ('105', '3-105', '88');
insert into score (sno, cno, degree) values ('109', '3-105', '76');
insert into score (sno, cno, degree) values ('101', '3-105', '64');
insert into score (sno, cno, degree) values ('107', '3-105', '91');
insert into score (sno, cno, degree) values ('108', '3-105', '78');
insert into score (sno, cno, degree) values ('101', '6-166', '85');
insert into score (sno, cno, degree) values ('107', '6-166', '79');
insert into score (sno, cno, degree) values ('108', '6-166', '81');


insert into teacher (tno, tname, tsex, tbirthday, prof, depart) values ('804', '李诚','男','1958-12-02','副教授','计算机系');
insert into teacher (tno, tname, tsex, tbirthday, prof, depart) values ('856', '张旭','男','1969-03-12','讲师','电子工程系');
insert into teacher (tno, tname, tsex, tbirthday, prof, depart) values ('825', '王萍','女','1972-05-05','助教','计算机系');
insert into teacher (tno, tname, tsex, tbirthday, prof, depart) 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. 查询助教所有的单位即不另行的Depart列。

    select distinct depart from teacher;

  3. 询问Student表的富有记录。

    select * from student;

  4. 询问Score表中培育在60到80里头的有所记录。

    select * from score where degree between 60 and 80;

  5. 查询Score表中战表为85,86或88的笔录。

    select * from score where degree in (85, 86, 88);

  6. 询问Student表中“95031”班或性别为“女”的同窗记录。

    select * from student where class = ‘95031’ or ssex = ‘女’;

  7. 以Class降序查询Student表的具备记录。

    select * from student order by class desc;

  8. 以Cno升序、Degree降序查询Score表的有着记录。

    select * from score order by cno asc, degree desc;

  9. 询问“95031”班的学习者人数。

    select count(*) from student where class = ‘95031’;

10.查询Score表中的最高分的学童学号和课程号。

select * from score sc  where degree = (select max(degree) as max from score where cno = sc.cno group by cno);

11.询问每门课的平均成绩。

select cno, avg(degree) as avg from score group by cno;

12.查询Score表中足足有5名学生选修的并以3开首的课程的平分分数。

select cno, avg(degree) as avg 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.询问所有学生的Sname、Cno和Degree列。

select sname, cno, degree from student s left join score sc on sc.sno = s.sno;

15.查询所有学生的Sno、Cname和Degree列。

select s.sno, c.cname, sc.degree from student s left join score sc on sc.sno = s.sno left join course c on c.cno = sc.cno;

16.询问所有学员的Sname、Cname和Degree列。

select s.sname, c.cname, sc.degree from student s left join score sc on sc.sno = s.sno left join course c on c.cno = sc.cno;

17.询问“95033”班学生的平分分。

select cno , avg(degree)  from score sc where sc.sno in (select sno from student where class = '95033') group by cno;

18.查询选修“3-105”课程的实绩超越“109”号同学战绩的享有同学的记录。

select * from score where sno = '109' and cno = '3-105';

19.询问成绩高于学号为“109”、课程号为“3-105”的成就的有所记录。

select * from score where  cno = '3-105' and degree > (select degree from score where sno = '109'and cno = '3-105'); -- 此处理解为只看‘3-105’课程成绩
select * from score where degree > (select degree from score where sno = '109'and cno = '3-105'); -- 此处为各科成绩都算。

20.查询和学号为108、101的同桌同年出生的保有学员的Sno、Sname和Sbirthday列。(使用year()方法对生日字段求年份)

select sno,sname,sbirthday from student where year(sbirthday) in (select year(sbirthday) from student where sno in ('108', '101'));

21.询问“张旭“教授授课的学员成绩。

select sc.* from score sc inner join course c on c.cno = sc.cno inner join teacher t on t.tno = c.tno where t.tname = '张旭'; -- 合并多个表然后查询
select * from score where cno in(select cno from course where tno in(select tno from teacher where tname ='张旭')); -- 嵌套查询

22.查询选修某课程的同校人数多于5人的少将姓名。

select tname from teacher where tno = (select tno from course where cno = (select cno from score group by cno having count(*) > 5));

23.询问95033班和95031班全体学生的记录。

select * from student where class in ('95033', '95031');

24.查询存在有85分以上成绩的教程Cno。

select distinct cno from score where degree > 85;

25.查询出“总结机系“助教所教课程的成绩表。

select * from score where cno in (select cno from course where tno in (select tno from teacher where depart = '计算机系')); 

26.询问“总计机系”与“电子工程系“不同职衔的老师的Tname和Prof。

select tname, prof from teacher where depart = '计算机系' and prof not in (select prof from teacher where depart = '电子工程系')union select tname, prof from teacher where depart = '电子工程系' and prof not in (select prof from teacher where depart = '计算机系');

27.查询所有老师和同班的name、sex和birthday。

select sname as `name`, ssex as `sex`, sbirthday as `birthday` from student union select tname, tsex,tbirthday from teacher;

28.询问所有“女”讲师和“女”同学的name、sex和birthday。

select sname as `name` , ssex as `sex`, sbirthday as `birthday`from student where ssex = '女' union select tname, tsex , tbirthday from teacher where tsex = '女';

29.查询战绩比该科目平均战绩低的同学的战绩表。

select * from score sc where degree < (select avg(degree) as avg from score where cno = sc.cno group by cno);

30.询问所有任课教授的Tname和Depart。

select tname, depart from teacher where tno in (select tno from course);

31.询问所有未讲课的教授的Tname和Depart。

select tname, depart from teacher where tno in (select tno from course where cno not in (select cno from score)); -- 此处理解为没有成绩的课程为未讲课的课程。

32.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;

33.查询Student表中不姓“王”的校友记录。

select * from student where sname not like '王%';

34.询问Student表中各种学生的姓名和年龄(使用year()方法对日期字段)。

select sname, (year(now()) - year(sbirthday)) as nian_ling from student;

35.查询Student表中最大和微小的Sbirthday日期值。

select max(sbirthday) as max,min(sbirthday) as min from student;

36.以班号和年龄从大到小的逐一查询Student表中的全部笔录。

select * from student order by class desc, sbirthday asc; 

37.查询“男”助教及其所上的教程。

select t.*, c.cno, c.cname from teacher t inner join course c on c.tno = t.tno where t.tsex = '男';

38.询问最高分同学的Sno、Cno和Degree列。

select sno, cno, degree from score sc where degree = (select max(degree) as max from score where cno = sc.cno group by cno);

39.查询和“李军”同性其他所有同学的Sname。

select sname from student where ssex in (select ssex from student where sname = '李军');

40.询问和“李军”同性别并同班的同桌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');

41.查询所有选修“计算机导论”课程的“男”同学的战表表。

select * 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');

 

–第四题 查询Score表中成就在60到80以内的装有记录。
select * from Score where Degree between 60 and 80

create table Course #课程表
(
Cno varchar(20) not null primary key,
Cname varchar(20) not null,
Tno varchar(20) not null,
foreign key (Tno) references Teacher(Tno)
);

–第四题 查询Score表中成就在60到80中间的保有记录。
select * from Score where Degree between 60 and 80

–第五题 查询Score表中作育为85,86或88的笔录。
select * from Score where Degree in (’85’,’86’,’88’)

create table Score #成绩表
(
ids int auto_increment primary key,
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)
);

–第五题 查询Score表中培养为85,86或88的记录。
select * from Score where Degree in (’85’,’86’,’88’)

–第六题 查询Student表中“95031”班或性别为“女”的校友记录。
select * from student where Class=’95031′ or Ssex=’女’

#添加数码

–第六题 查询Student表中“95031”班或性别为“女”的同窗记录。
select * from student where Class=’95031′ or Ssex=’女’

–第七题 以Class降序查询Student表的具备记录。
select * from student order by Class desc

#学业讲解和复习,MySQL查询语句实练习习。Student学生表

–第七题 以Class降序查询Student表的有着记录。
select * from student order by Class desc

–第八题 以Cno升序、Degree降序查询Score表的拥有记录。
select * from Score order by Cno asc,Degree desc

insert into Student values(‘108′,’曾华’,’男’,’1977-09-01′,’95033′);

–第八题 以Cno升序、Degree降序查询Score表的具有记录。
select * from Score order by Cno asc,Degree desc

–第九题 查询“95031”班的学员人数。
select count(*) from student where Class=’95031′ –*可以换成主键值

insert into Student values(‘105′,’匡明’,’男’,’1975-10-02′,’95031′);

–第九题 查询“95031”班的学员人数。
select count(*) from student where Class=’95031′ –*可以换成主键值

–第十题 查询Score表中的最高分的学员学号和课程号。(子查询或者排序)
select SNO,CNO from Score where Degree=(select MAX(Degree) from Score)

insert into Student values(‘107′,’王丽’,’女’,’1976-01-23′,’95033′);

–第十题 查询Score表中的最高分的学员学号和课程号。(子查询或者排序)
select SNO,CNO from Score where Degree=(select MAX(Degree) from Score)

–第十一题 查询每门课的平均成绩。
select Cno,AVG(Degree) as 平均分 from Score group by Cno

insert into Student values(‘101′,’李军’,’男’,’1976-02-20′,’95033′);

–第十一题 查询每门课的平分成绩。
select Cno,AVG(Degree) as 平均分 from Score group by Cno

select Cname from Course where Cno in (select Cno a from Score group by
Cno) 
union
select Cno,AVG(Degree) from Score group by Cno

insert into Student values(‘109′,’王芳’,’女’,’1975-02-10′,’95031′);

select Cname from Course where Cno in (select Cno a from Score group by
Cno)
union
select Cno,AVG(Degree) from Score group by Cno

 

insert into Student values(‘103′,’陆君’,’男’,’1974-06-03′,’95031′);

 

 

#Teacher教师表

 

–第十二题 查询Score表中最少有5名学员选修的并以3方始的课程的平分分数。
select AVG(Degree ) from Score where Cno like ‘3%’ group by Cno having
COUNT(Cno)>4

insert into Teacher
values(‘804′,’李诚’,’男’,’1958-12-02′,’副教师’,’统计机系’);

–第十二题 查询Score表中至少有5名学生选修的并以3上马的课程的平分分数。
select AVG(Degree ) from Score where Cno like ‘3%’ group by Cno having
COUNT(Cno)>4

–第十三题 查询分数大于70,小于90的Sno列。
select sno from Score where Degree between 70 and 90

insert into Teacher
values(‘856′,’张旭’,’男’,’1969-03-12′,’教师’,’电子工程系’);

–第十三题 查询分数大于70,小于90的Sno列。
select sno from Score where Degree between 70 and 90

–第十四题 查询所有学生的Sname、Cno和Degree列。
select Sname,Cno,Degree from student join Score on student.Sno=Score.Sno

insert into Teacher
values(‘825′,’王萍’,’女’,’1972-05-05′,’教授’,’总结机系’);

–第十四题 查询所有学员的Sname、Cno和Degree列。
select Sname,Cno,Degree from student join Score on student.Sno=Score.Sno

–第十五题 查询所有学生的Sno、Cname和Degree列。
select Sno,Cname,degree from Score join Course on Course.Cno=Score.Cno

insert into Teacher
values(‘831′,’刘冰’,’女’,’1977-08-14′,’教授’,’电子工程系’);

–第十五题 查询所有学生的Sno、Cname和Degree列。
select Sno,Cname,degree from Score join Course on Course.Cno=Score.Cno

–第十六题 查询所有学员的Sname、Cname和Degree列。
select student.Sname,Cname,degree from student join Score on
student.Sno=Score.Sno join Course on Course.Cno=Score.Cno

 

–第十六题 查询所有学生的Sname、Cname和Degree列。
select student.Sname,Cname,degree from student join Score on
student.Sno=Score.Sno join Course on Course.Cno=Score.Cno

–第十七题 查询“95033”班学员的平均分。
select AVG(Degree) from Score where Sno in (select Sno from student
where Class=’95033′)

#Course课程表

–第十七题 查询“95033”班学生的平分分。
select AVG(Degree) from Score where Sno in (select Sno from student
where Class=’95033′)

select AVG(Degree) from Score,student where student.Sno=Score.Sno and
Class=’95033′

insert into Course values(‘3-105′,’计算机导论’,’825′);

select AVG(Degree) from Score,student where student.Sno=Score.Sno and
Class=’95033′

–第十八题 借使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。

insert into Course values(‘3-245′,’操作系统’,’804′);

–第十八题 即使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。

select Sno,Cno,Degree,[RANK] from grade join Score on Score.Degree
between low and upp

insert into Course values(‘6-166′,’数字电路’,’856′);

select Sno,Cno,Degree,[RANK] from grade join Score on Score.Degree
between low and upp

select Sno,Cno,Degree,[RANK] from Score,grade where Degree between low
and upp

insert into Course values(‘9-888′,’高等数学’,’831′);

select Sno,Cno,Degree,[RANK] from Score,grade where Degree between low
and upp

–第十九题
查询选修“3-105”课程的战表领先“109”号同学成绩的具有同学的记录。
select * from student,Score where Score.Cno=’3-105′ and
student.Sno=Score.Sno and Score.Degree>(select Degree from Score
where Cno=’3-105′ and Sno=’109′)

#Score成绩表

–第十九题
查询选修“3-105”课程的实绩当先“109”号同学战绩的有所同学的笔录。
select * from student,Score where Score.Cno=’3-105′ and
student.Sno=Score.Sno and Score.Degree>(select Degree from Score
where Cno=’3-105′ and Sno=’109′)

–第二十题 查询score中选学多门学科的同校中分数为非最高分战绩的笔录。
select * from Score a where Degree <(select MAX(degree) from Score b
where a.Cno=b.Cno) and Sno in(select Sno from Score group by Sno having
count(*)>1)

insert into Score values(”,’103′,’3-245′,’86’);

–第二十题 查询score中选学多门科目标同班中分数为非最高分战绩的笔录。
select * from Score a where Degree <(select MAX(degree) from Score b
where a.Cno=b.Cno) and Sno in(select Sno from Score group by Sno having
count(*)>1)

–第二十一题
查询成绩高于学号为“109”、课程号为“3-105”的成就的有着记录。
select * from student,Score where student.Sno=Score.Sno and
Score.Degree>(select Degree from Score where Cno=’3-105′ and
Sno=’109′)

insert into Score values(”,’105′,’3-245′,’75’);

–第二十一题
查询成绩高于学号为“109”、课程号为“3-105”的成就的保有记录。
select * from student,Score where student.Sno=Score.Sno and
Score.Degree>(select Degree from Score where Cno=’3-105′ and
Sno=’109′)

–第二十二题
查询和学号为107的同窗同年出生的富有学员的Sno、Sname和Sbirthday列。
select Sno,Sname,Sbirthday from student where
year(student.Sbirthday)=(select year(Sbirthday) from student where
Sno=’107′)

insert into Score values(”,’109′,’3-245′,’68’);

–第二十二题
查询和学号为107的同校同年出生的有着学生的Sno、Sname和Sbirthday列。
select Sno,Sname,Sbirthday from student where
year(student.Sbirthday)=(select year(Sbirthday) from student where
Sno=’107′)

–第二十三题 查询“张旭“助教授课的学员战表。
–select Degree from Score,Teacher,Course where Teacher.Tname=’张旭’ and
Teacher.Tno=Course.Tno and Course.Cno=Score.Cno

insert into Score values(”,’103′,’3-105′,’92’);

–第二十三题 查询“张旭“助教讲课的学生成绩。
–select Degree from Score,Teacher,Course where Teacher.Tname=’张旭’ and
Teacher.Tno=Course.Tno and Course.Cno=Score.Cno

select Sno,Cno,Degree from Score where Cno in (select Cno from Course
where Tno in (select Tno from Teacher where Tname=’张旭’))

insert into Score values(”,’105′,’3-105′,’88’);

select Sno,Cno,Degree from Score where Cno in (select Cno from Course
where Tno in (select Tno from Teacher where Tname=’张旭’))

–第二十四题 查询选修某课程的同窗人数多于5人的师资姓名。
select Tname from Teacher where Tno in (select Tno from Course where Cno
in (select Cno from Score group by Cno having COUNT(*)>5) )

insert into Score values(”,’109′,’3-105′,’76’);

–第二十四题 查询选修某课程的同桌人数多于5人的助教姓名。
select Tname from Teacher where Tno in (select Tno from Course where Cno
in (select Cno from Score group by Cno having COUNT(*)>5) )

–第二十五题 查询95033班和95031班全部学生的记录。
select * from student where Class=’95033′ or Class=’95031′

insert into Score values(”,’101′,’3-105′,’64’);

–第二十五题 查询95033班和95031班全体学生的笔录。
select * from student where Class=’95033′ or Class=’95031′

–第二十六题 查询存在有85分以上成绩的课程Cno.
select distinct cno from Score where Degree>85

insert into Score values(”,’107′,’3-105′,’91’);

–第二十六题 查询存在有85分以上成绩的教程Cno.
select distinct cno from Score where Degree>85

–第二十七题 查询出“计算机系“教授所教课程的战表表。
select sno,Cno ,Degree from Score where Cno in (select Cno from Course
where Tno in (select tno from Teacher where Depart=’总括机系’))

insert into Score values(”,’108′,’3-105′,’78’);

–第二十七题 查询出“总括机系“助教所教课程的成绩表。
select sno,Cno ,Degree from Score where Cno in (select Cno from Course
where Tno in (select tno from Teacher where Depart=’总括机系’))

–第二十八题
查询“总括机系”与“电子工程系“不一样职衔的中将的Tname和Prof。使用相关子查询
select Tname,Prof from Teacher a where Prof not in(select Prof from
Teacher b where a.Depart!=b.Depart)

insert into Score values(”,’101′,’6-166′,’85’);

–第二十八题
查询“总括机系”与“电子工程系“分裂职衔的助教的Tname和Prof。使用相关子查询
select Tname,Prof from Teacher a where Prof not in(select Prof from
Teacher b where a.Depart!=b.Depart)

–第二十九题
查询选修编号为“3-105“课程且战表至少当先选修编号为“3-245”课程的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。
select Cno,Sno,Degree from Score a where (select Degree from Score b
where Cno=’3-105′ and b.Sno=a.Sno)>=(select Degree from Score c where
Cno=’3-245′ and c.Sno=a.Sno) order by Degree desc

insert into Score values(”,’107′,’6-166′,’79’);

–第二十九题
查询选修编号为“3-105“课程且战表至少超过选修编号为“3-245”课程的同室的Cno、Sno和Degree,并按Degree从高到低次序排序。
select Cno,Sno,Degree from Score a where (select Degree from Score b
where Cno=’3-105′ and b.Sno=a.Sno)>=(select Degree from Score c where
Cno=’3-245′ and c.Sno=a.Sno) order by Degree desc

select * from Score where Cno=’3-105′ and Degree >any(select Degree
from Score where Cno=’3-245′)

insert into Score values(”,’108′,’6-166′,’81’);

select * from Score where Cno=’3-105′ and Degree >any(select Degree
from Score where Cno=’3-245′)

–第三十题
查询选修编号为“3-105”课程且战绩当先选修编号为“3-245”课程的同桌的Cno、Sno和Degree.
select Cno,Sno,Degree from Score a where (select Degree from Score b
where Cno=’3-105′ and b.Sno=a.Sno)>(select Degree from Score c where
Cno=’3-245′ and c.Sno=a.Sno)

 

–第三十题
查询选修编号为“3-105”课程且成绩超乎选修编号为“3-245”课程的同班的Cno、Sno和Degree.
select Cno,Sno,Degree from Score a where (select Degree from Score b
where Cno=’3-105′ and b.Sno=a.Sno)>(select Degree from Score c where
Cno=’3-245′ and c.Sno=a.Sno)

–第三十一题 查询所有老师和同班的name、sex和birthday.
select distinct Sname as name,Ssex as sex,Sbirthday as birthday from
student
union
select distinct Tname as name,Tsex as sex,Tbirthady as birthday from
Teacher

#查询

–第三十一题 查询所有老师和同学的name、sex和birthday.
select distinct Sname as name,Ssex as sex,Sbirthday as birthday from
student
union
select distinct Tname as name,Tsex as sex,Tbirthady as birthday from
Teacher

–第三十二题 查询所有“女”教师和“女”同学的name、sex和birthday.
select distinct Sname as name,Ssex as sex,Sbirthday as birthday from
student where Ssex=’女’
union
select distinct Tname as name,Tsex as sex,Tbirthady as birthday from
Teacher where Tsex=’女’

 

–第三十二题 查询所有“女”教授和“女”同学的name、sex和birthday.
select distinct Sname as name,Ssex as sex,Sbirthday as birthday from
student where Ssex=’女’
union
select distinct Tname as name,Tsex as sex,Tbirthady as birthday from
Teacher where Tsex=’女’

–第三十三题 查询成绩比该科目平均成绩低的同桌的战表表。
select Sno,Cno,Degree from Score a where a.Degree<(select AVG(Degree)
from Score b where a.Cno=b.Cno)

1、 查询Student表中的所有记录的Sname、Ssex和Class列。

–第三十三题 查询战表比该科目平均战表低的校友的战绩表。
select Sno,Cno,Degree from Score a where a.Degree<(select AVG(Degree)
from Score b where a.Cno=b.Cno)

–第三十四题 查询所有任课助教的Tname和Depart.
select Tname,Depart from Teacher where Tname in (select distinct Tname
from Teacher,Course,Score where Teacher.Tno=Course.Tno and
Course.Cno=Score.Cno)

select Sname,Ssex,Class from Student

–第三十四题 查询所有任课教授的Tname和Depart.
select Tname,Depart from Teacher where Tname in (select distinct Tname
from Teacher,Course,Score where Teacher.Tno=Course.Tno and
Course.Cno=Score.Cno)

select Tname,Depart from Teacher where tno in (select tno from course
where Cno in (select distinct Cno from Score))

 

select Tname,Depart from Teacher where tno in (select tno from course
where Cno in (select distinct Cno from Score))

–第三十五题 查询所有未讲课的名师的Tname和Depart. 
select Tname,Depart from Teacher where Tname not in (select distinct
Tname from Teacher,Course,Score where Teacher.Tno=Course.Tno and
Course.Cno=Score.Cno)
–第三十六题 查询至少有2名男生的班号。
select Class FROM student where Ssex=’男’ group by Class having
COUNT(*)>1

2、 查询教师所有的单位即不另行的Depart列。

–第三十五题 查询所有未讲课的先生的Tname和Depart.
select Tname,Depart from Teacher where Tname not in (select distinct
Tname from Teacher,Course,Score where Teacher.Tno=Course.Tno and
Course.Cno=Score.Cno)
–第三十六题 查询至少有2名男生的班号。
select Class FROM student where Ssex=’男’ group by Class having
COUNT(*)>1

–第三十七题 查询Student表中不姓“王”的同班记录。
select * from student where Sname not like (‘王%’)

select distinct Depart from Teacher

–第三十七题 查询Student表中不姓“王”的同校记录。
select * from student where Sname not like (‘王%’)

–第三十八题 查询Student表中种种学生的真名和年龄。
select Sname,YEAR(GETDATE())-year(Sbirthday) from student

 

–第三十八题 查询Student表中各样学员的全名和年龄。
select Sname,YEAR(GETDATE())-year(Sbirthday) from student

–第三十九题 查询Student表中最大和微小的Sbirthday日期值。
select MAX(Sbirthday) as 最大,MIN(Sbirthday) as 最小 from student

3、 查询Student表的所有记录。

–第三十九题 查询Student表中最大和微小的Sbirthday日期值。
select MAX(Sbirthday) as 最大,MIN(Sbirthday) as 最小 from student

–第四十题 以班号和年龄从大到小的逐条查询Student表中的全部记下。
select * from student order by Class desc,Sbirthday asc

select * from Student

–第四十题 以班号和年龄从大到小的相继查询Student表中的全体记录。
select * from student order by Class desc,Sbirthday asc

–第四十一题 查询“男”助教及其所上的教程。
select Tname,Cname from Teacher,Course where Tsex=’男’ and
Teacher.Tno=Course.Tno

 

–第四十一题 查询“男”助教及其所上的课程。
select Tname,Cname from Teacher,Course where Tsex=’男’ and
Teacher.Tno=Course.Tno

–第四十二题 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)

4、 查询Score表中战绩在60到80之内的兼具记录。

–第四十二题 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 top 1* from Score order by Degree desc

select * from Score where Degree between 60 and 80

select top 1* from Score order by Degree desc

–第四十三题 查询和“李军”同性其他所有同学的Sname.
select Sname from student where Ssex=(select Ssex from student where
Sname=’李军’) and Sname not in (‘李军’)

 

–第四十三题 查询和“李军”同性其他所有同学的Sname.
select Sname from student where Ssex=(select Ssex from student where
Sname=’李军’) and Sname not in (‘李军’)

–第四十四题 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 Sname not in (‘李军’) and Class=(select Class from
student where Sname=’李军’)

5、 查询Score表中培养为85,86或88的记录。

–第四十四题 查询和“李军”同性别并同班的同校Sname.
select Sname from student where Ssex=(select Ssex from student where
Sname=’李军’) and Sname not in (‘李军’) and Class=(select Class from
student where Sname=’李军’)

–第四十五题 查询所有选修“计算机导论”课程的“男”同学的战绩表。
select Sno,Degree from Score where Sno in (select Sno from student where
Ssex=’男’) and Cno in (select Cno from Course where Cname=’统计机导论’)

select * from Score where Degree in(85,86,88)

–第四十五题 查询所有选修“总括机导论”课程的“男”同学的成绩表。
select Sno,Degree from Score where Sno in (select Sno from student where
Ssex=’男’) and Cno in (select Cno from Course where Cname=’总计机导论’)

 

 

 

 

6、 查询Student表中“95031”班或性别为“女”的同窗记录。

 

复习

select * from Student where Class=’95031′ or Ssex=’女’

复习

1、数据库操作
create database 数据库名称
drop database 数据库名称
use 数据库名称
go 两条SQL语句之间的距离

 

1、数据库操作
create database 数据库名称
drop database 数据库名称
use 数据库名称
go 两条SQL语句之间的距离

2、表操作
create table 表名(列名 类型 其他,列名 类型,其他)
primary key 主键
identity 自增加列
not null 非空
unique 唯一
references 外键 references 主表名(主表主键列)
外键一般是从表的列关联到主表的主键上
drop table 表名 删除表

7、 以Class降序查询Student表的持有记录。

2、表操作
create table 表名(列名 类型 其他,列名 类型,其他)
primary key 主键
identity 自增加列
not null 非空
unique 唯一
references 外键 references 主表名(主表主键列)
外键一般是从表的列关联到主表的主键上
drop table 表名 删除表

3、数据操作

select * from Student order by Class desc

3、数据操作

增加 
insert into 表名 values (每一列的值)

 

增加
insert into 表名 values (每一列的值)

insert into 表名 (列名) values (列的值)

8、 以Cno升序、Degree降序查询Score表的装有记录。

insert into 表名 (列名) values (列的值)

修改

select * from Score order by Cno,Degree desc

修改

update 表名 set 列名=值,列名=值 where 筛选标准

 

update 表名 set 列名=值,列名=值 where 筛选标准

删除

9、 查询“95031”班的学员人数。

删除

delete from 表名 where 筛选标准

select sum(Class=95031) from Student

delete from 表名 where 筛选标准

查询
1、不难询问
select * from 表名

 

查询
1、简单询问
select * from 表名

select 列名 from 表名

10、 查询Score表中的最高分的学员学号和课程号。(子查询或者排序)

select 列名 from 表名

select 列名 as 别名 from 表名

select Sno,Cno from Score where degree=(select max(degree) from Score)

select 列名 as 别名 from 表名

2、
997755.com澳门葡京 ,规格查询

 

2、
基准查询

select * from 表名 where 条件1

11、 查询每门课的平均战表。

select * from 表名 where 条件1

select * from 表名 where 条件1 or 条件2

select avg(degree),Cno from score group by Cno;

select * from 表名 where 条件1 or 条件2

select * from 表名 where 条件1 and 条件2

 

select * from 表名 where 条件1 and 条件2

3、范围查询 between and

12、查询Score表中足足有5名学童选修的并以3起来的学科的平分分数。

3、范围查询 between and

select * from 表名 where 列名 between 值 and 值2

select avg(degree) from Score group by Cno having count(*)>=5 and
Cno like’3%’

select * from 表名 where 列名 between 值 and 值2

4、离散查询

 

4、离散查询

select * from 表名 where 列名 in (数据列表)

13、查询分数大于70,小于90的Sno列。

select * from 表名 where 列名 in (数据列表)

5、模糊查询 like
select * from 表名 where 列名 like ‘%_’

select Sno from Score where degree>70 and degree<90

5、模糊查询 like
select * from 表名 where 列名 like ‘%_’

6、排序查询 desc 降序

 

6、排序查询 desc 降序

select * from 表名 order by 列名

14、查询所有学员的Sname、Cno和Degree列。

select * from 表名 order by 列名

7、分组查询

select sname,cno,degree from student,score where student.sno = score.sno

7、分组查询

select * from 表名 group by 列名 having 条件

 

select * from 表名 group by 列名 having 条件

8、分页查询 top n 去前n个值
select top n 表名

15、查询所有学生的Sno、Cname和Degree列。

8、分页查询 top n 去前n个值
select top n 表名

9、去重查询

select sno,cname,degree from course,score where course.cno = score.cno

9、去重查询

select distinct 列名 from 表米

 

select distinct 列名 from 表米

10、聚合函数(总结函数)
select count(*) from 表名

16、查询所有学员的Sname、Cname和Degree列。

10、聚合函数(计算函数)
select count(*) from 表名

select sun(列名) from 表名

select sname,cname,degree from student,course,score where
student.sno=score.sno and course.cno = score.cno

select sun(列名) from 表名

AVG max min

 

AVG max min

二、高级查询

17、 查询“95033”班学员的平均分。

二、高级查询

1、连接查询
列的扩大 join on

select avg(degree) from score where sno in(select sno from student where
class=’95033′ )

1、连接查询
列的伸张 join on

协办查询 行的伸张 union

 

共同查询 行的增添 union

2、子查询
(1)非亲非故子查询
子查询和父查询没有早晚的涉及,子查询可以独自实施

18、 借使使用如下命令建立了一个grade表:
create 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。

2、子查询
(1)无关子查询
子查询和父查询没有早晚的关联,子查询可以独自实施

(2)相关子查询
子查询执行的时候必须选用父查询的内容作为条件

select sno,cno,rank from score,grade where degree between low and upp

(2)相关子查询
子查询执行的时候必须运用父查询的始末作为标准

 

 

 

19、查询选修“3-105”课程的实绩超乎“109”号同学战绩的拥有同学的记录。

select * from Score where Cno=’3-105′ and Degree>(select max(Degree)
from Score where Sno=’109′)

 

20、查询score中选学多门学科的同桌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
where sno in
(select sno from score group by sno having count(*)>1))

 

21、 查询成绩高于学号为“109”、课程号为“3-105”的实绩的有所记录。

select * from Score where Cno=’3-105′ and Degree>(select max(Degree)
from Score where Sno=’109’and Cno=’3-105′)

 

22、查询和学号为108的同桌同年出生的兼具学员的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“助教教学的学童战表。

Select degree from score where Cno in(Select Cno from course where
Tno=(Select Tno from Teacher where Tname=’张旭’))

 

24、查询选修某课程的同桌人数多于5人的园丁姓名。

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班全部学生的记录。

Select * from Student where class in (‘95033′,’95031’)

 

26、 查询存在有85分以上成绩的教程Cno.

Select Cno from score where degree>85

 

27、查询出“总计机系“助教所教课程的战绩表。

Select * from Teacher,Course,Score where Teacher.Depart=’总括机系’and
Teacher.Tno=Course.Tno and Course.Cno=Score.Cno

select * from score where cno in(select cno from course where tno
in(select tno from teacher where depart=’总结机系’))

28、查询“统计 机系”与“电子工程系“不一致职衔的先生的Tname和Prof。

select tname,prof from teacher where depart=’总计机系’ and prof not
in(select prof from teacher where depart=’电子工程系’ )union
select tname,prof from teacher where depart=’电子工程系’ and prof not
in(select prof from teacher where depart=’计算机系’)

29、查询选修编号为“3-105“课程且战绩至少当先选修编号为“3-245”的同桌的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>any(select degree from Score where Cno=’3-245′) order by
degree desc

30、查询选修编号为“3-105”且战绩超过选修编号为“3-245”课程的同班的Cno、Sno和Degree.

select Cno,Sno,Degree from Score where Cno=’3-105′ and
Degree>all(select degree from Score where Cno=’3-245′)

31、 查询所有老师和同班的name、sex和birthday.

Select Sname,Ssex,Sbirthday from Student
union
Select Tname,Tsex,Tbirthday from Teacher

 

32、查询所有“女”教授和“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、 查询战绩比该课程平均成绩低的同校的成绩表。

Select Degree from score a where Degree<(Select Avg(Degree) from
score b 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
where Cno in(select Cno from Score group by Cno))

 

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”的同班记录。

select * from Student where Sname not like ‘王%’

38、查询Student表中每个学员的真名和年龄。

select Sname,year(now())-year(Sbirthday) from Student

39、查询Student表中最大和微小的Sbirthday日期值。

select min(Sbirthday),min(Sbirthday) from Student

40、以班号和年龄从大到小的逐一查询Student表中的全体记录。

select * from Student order by Sbirthday,Class desc

41、查询“男”教授及其所上的学科。

select Cno,Tname from Course,Teacher where course.tno=teacher.tno and
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”同性其他所有同学的Sname.

select Sname from Student where Ssex=(select Ssex from Student where
Sname=’李军’)

44、查询和“李军”同性别并同班的同班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“统计机导论”课程的“男”同学的成绩表。

select degree from score where Cno=(select Cno from Course where
Cname=’计算机导论’) and Sno in (select sno from Student where Ssex=’男’)

 

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