1. 建表
1 create table student(
2 sno char(8),
3 sname char(8),
4 sbirth date,
5 ssex char(2),
6 sdept char(30)
7 );
2. 删表
3. 常见数据类型
4. 声明主码
1 create table student(
2 sno char(8) primary key,
3 sname char(8),
4 sbirth date,
5 ssex char(2),
6 sdept char(30)
7 );
5. 声明外码
1 create table course (
2 cno char(8) primary key,
3 cname char(30),
4 cpno char(8) references course(cno),
5 credit smallint
6 );
6. 声明主码，外码的另一种方式
1 create table sc (
2 sno char(8),
3 cno char(8),
4 grade smallint,
5 primary key(sno,cno),
6 foreign key(sno) references student(sno),
7 foreign key(cno) references course(cno)
8 );