外部キーの関連付けを行う SQL 文の完全な例

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,'Xiao Ming',1);
INSERT INTO student VALUES(2,'Xiao Hong',1);
INSERT INTO student VALUES(3,'Xiaogang',1);
INSERT INTO student VALUES(4,'Xiaowang',1);
INSERT INTO student VALUES(5,'Xiaozhi',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,'Chen Teacher');
SELECT * FROM teacher;

KEY `fktid` (`tid`),
CONSTRAINT `fktid` FOREIGN KEY(`tid`) REFERENCES `teacher` (`id`)