mysql创建四张表 分别存储 学生信息 课程信息 分数表 教师信息表

学生信息表 Student
字段名 字段类型 字段约束 / 含义
Sno Varchar(3) Not null / 学员编号
Sname Varchar(4) Not null / 学员姓名
Ssex Varchar(2) Not null / 性别
Sbirthday Datetime 生日
Classnum Varchar(5) 班级号

CREATE TABLE STUDENT
(
SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATETIME,
CLASS VARCHAR(5)
)
课程信息表 course
字段名 字段类型 字段约束 / 含义
Cno Varchar(5) Not null / 课程编号
Cname Varchar(10) Not null / 课程名称
Tno Varchar(10) Not null / 授课老师编号

CREATE TABLE COURSE
(CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL)
成绩表score
字段名 字段类型 字段约束 / 含义
Sno Varchar(3) Not null / 学员编号
Cno Varchar(5) Not null / 课程编号
Degree Double(3,1) Not null / 分数

CREATE TABLE SCORE
(SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL)
讲师表teacher
字段名 字段类型 字段约束 / 含义
Tno Varchar(3) Not null / 讲师编号
Tname Varchar(4) Not null / 讲师姓名
Tsex Varchar(2) Not null / 讲师性别
Tbirthday Datetime Not null / 出生日期
Prof Varchar(6) 等级
Depart Varchar(10) 所属院系

CREATE TABLE TEACHER
(TNO VARCHAR(3) NOT NULL,
TNAME VARCHAR(4) NOT NULL, TSEX VARCHAR(2) NOT NULL,
TBIRTHDAY DATETIME NOT NULL, PROF VARCHAR(6),
DEPART VARCHAR(10) NOT NULL);

向表中存储数据
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);
GO
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’ ,‘数据电路’ ,856);
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES (‘9-888’ ,‘高等数学’ ,100);
GO
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,‘6-106’,79);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (108,‘6-166’,81);
GO
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’);

=======
表一：student学生use)

1、create table student(

sno varchar(20) primary key not null comment’学号(主码)',

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’

)default charset=utf8;

表(二)Course(课程表)

create table course(

cno varchar(20) primary key not null comment’课程号(主码)',

cname varchar(20) not null comment’课程名称’,

tno varchar(20) not null comment’教工编号’

)default charset=utf8;

表(三)Score(成绩表)

create table score(

id int primary key auto_increment comment’主键自增’,

sno varchar(20) not null comment’学号’,

cno varchar(20) not null comment’课程号’,

degree Decimal(4,1) comment’成绩’

)default charset=utf8;

表四 teacher(教师表)

create table teacher(

tno varchar(20) primary key not null comment’教工编号(主码)',

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’
)default charset=utf8;

学生表数据的插入：

insert into student values

(‘108’,‘曾华’,‘男’,‘1977-09-01’,‘95033’),

(‘105’,‘匡明’,‘男’,‘1977-09-01’,‘95031’),

(‘107’,‘王丽’,‘女’,‘1977-09-01’,‘95033’),

(‘101’,‘李军’,‘男’,‘1977-09-01’,‘95033’),

(‘109’,‘王芳’,‘女’,‘1977-09-01’,‘95031’),

(‘103’,‘陆君’,‘男’,‘1977-09-01’,‘95031’
);

课程表数据的插入：

insert into course values

(‘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’);

成绩表数据的插入：

select cno from score group by cno; #找出这个表中所有的班级

insert into score(sno,cno,degree) values

(‘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’);

教师表数据的插入：

insert into teacher values

(‘804’,‘李诚’,‘男’,‘1958-12-02’,‘副教授’,‘计算机系’),

(‘856’,‘张旭’,‘男’,‘1969-03-12’,‘讲师’,‘电子工程系’),

(‘825’,‘王萍’,‘女’,‘1972-05-05’,‘助教’,‘计算机系’),

(‘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>60 and degree<80;

5、 查询Score表中成绩为85，86或88的记录。
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,Degree desc;

9、 查询“95031”班的学生人数。
select count(Classnum) from student where Classnum=‘95031’;

10、查询Score表中的最高分的学生学号和课程号。

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 where Cno=‘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 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 score left join course on score.Cno=course.Cno;

16、查询所有学生的Sname、Cname和Degree列。
select sname,cname,degree from student,score,course where student.sno=score.sno and course.cno=score.cno;
或
select student.sname,cname,degree from student join score on student.sno = score.sno left join course on course.cno = score.cno;

17、查询“95033”班所选课程的平均分。
select avg(Degree) from student left join score on student.Sno=score.Sno where class=‘95033’;
或
select avg(degree) from student t1 ,score t2 where t1.sno=t2.sno group by class having class=‘95033’;
或
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 float(3,0),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’);
commit;
现查询所有同学的Sno、Cno和rank列。
select Sno,Cno,rank from score A join grade B where Degree between B.low and B.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 score where Cno=‘3-105’ and Degree > (select Degree from score where Cno=‘3-105’ and Sno=109);

######20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。（难）
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);

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);

year（）函数只显示年份
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。（难）
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 Classnum 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;

27、查询出“计算机系“教师所教课程的成绩表。
select Degree,score.Cno from (score left join course on score.Cno=course.Cno) left join teacher on course.Tno=teacher.Tno where teacher.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’ and Prof not 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 max(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’) ；

31、查询所有教师和同学的name、sex和birthday.
select student.Sname as name,student.Ssex as sex,student.Sbirthday as birthday from student ;
同理得教师

32、查询所有“女”教师和“女”同学的name、sex和birthday.
select student.Sname as name,student.Ssex as sex,student.Sbirthday as birthday from student where Ssex=‘女’;
同理得女教师

######33、查询成绩比该课程平均成绩低的同学的成绩表。
select A.Degree from score A where Degree < (select avg(Degree) from score B where A.Cno=B.Cno)；

########34、查询所有任课教师的Tname和Depart.（较多不会）
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）;

#######35 查询所有未讲课的教师的Tname和Depart. （较多不会）
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);

#######36、查询至少有2名男生的班号。
select A.Classnum from student A where Ssex=‘男’ group by Classnum having count(‘Ssex’)>1;

#######37、查询Student表中不姓“王”的同学记录。（较多不会）
select * from student where Sname not like ‘王%’;

not like

###38、查询Student表中每个学生的姓名和年龄。（较多不会）

select ( Year(CurDate())-year(Sbirthday)) as age,Sname from student;

year(curdate()) 当前年份
##39、查询Student表中最大和最小的Sbirthday日期值。
select MAX(Sbirthday) as 最大,MIN(Sbirthday) as 最小 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 Classnum desc,Sbirthday asc;

41、查询“男”教师及其所上的课程。
select Tname,Cname from teacher left 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=(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 A where Ssex=(select Ssex from student B where Sname=‘李军’) and Classnum=(select Classnum from student B where Sname=‘李军’) and Sname not in (‘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 A join course B on A.Cno=B.Cno ) join student C on A.Sno=C.Sno where B.Cname=‘计算机
导论’ and C.Ssex=‘男’;

year(curdate()) 当前年份

curdate()当前日期文章来源地址https://www.toymoban.com/news/detail-801034.html

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