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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