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`)