sql语句创建外键关联的完整实例

以创建学生教师表为例: 学生 id 关联教师 tid

学生表: student

教师表: teacher

sql语句 :

use school;

create table student(
id int(10) not null primary key,
name varchar(30) default null,
tid int(10) default null,
key `fktid` (`tid`),
constraint `fktid` foreign key(`tid`) references `teacher` (`id`)
)engine=innodb default charset=utf8

insert into student values(1,'小明',1);
insert into student values(2,'小红',1);
insert into student values(3,'小刚',1);
insert into student values(4,'小王',1);
insert into student values(5,'小智',1);

select * from student;

create table teacher (
id int(10) primary key not null,
name varchar (30) default null
)engine=innodb default charset=utf8


insert into teacher values(1,'陈老师');
select * from teacher;

重点: 外键关联语句,会手写才可以!

key `fktid` (`tid`),
constraint `fktid` foreign key(`tid`) references `teacher` (`id`)

总结

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