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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