sql語句創(chuàng)建外鍵關(guān)聯(lián)的完整實例

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,'小明',1);
INSERT INTO student VALUES(2,'小紅',1);
INSERT INTO student VALUES(3,'小剛',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,'陳老師');
SELECT * FROM teacher;

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