设计三张表

创建student表(学生表)

Create table student(Sid tinyint primary key auto_increment,Sname char(10),Sex char(5),Sage tinyint,Sdept char(20));

insert into student(Sid,Sname,Sex,Sage,Sdept) values(1,'张三','女',20,'IT ');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(2,'李四','女',25,'info ');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(3,'王五','男',22,'en ');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(4,'马云','女',28,'ch');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(5,'赵子龙','女',18,'info ');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(6,'王小','女',21,'info ');

insert into student(Sid,Sname,Sex,Sage,Sdept) values(7,'赵龙龙','男',24,'en ');

创建course表(课程表)

Create table course(Cid tinyint primary key auto_increment,Cname char(20),Ccredittinyint);

insert into course values(1,'数据结构',5);

insert into course values(2,'数据库',10);

insert into course values(3,'英语',3);

insert into course values(4,'数学',6);

创建sc表(选课表)

create table sc(Sid tinyint,Cidint,Gradeint);

insert into sc values(1,1,65);

insert into sc values(1,2,60);

insert into sc values(1,4,90);

insert into sc values(1,3,50);

insert into sc values(2,2,100);

insert into sc values(3,1,90);

insert into sc values(6,2,70);

insert into sc values(4,4,90);

insert into sc values(5,1,95);

insert into sc values(6,1,80);

insert into sc values(7,3,80);

创建admin表

create table admin(id int(10),qqint(20),uidint(5));

创建province表

create table province(id int(10) primary key auto_increment,pnamevarchar(30));

insert into province(id,pname) values(2,'上海');

insert into province(id,pname) values(3,'广州');

insert into province(id,pname) values(4,'成都');

创建student2表

create table student2(id int(10) primary key auto_increment,namevarchar(30),pidint(10),foreign key(pid) references province(id) on

delete cascade);

正则查询建表