创建关联表写法
创建省份
mysql> create table sheng(
-> id SMALLINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
-> pname VARCHAR(20) NOT NULL
-> );
创建城市
mysql> create table city(
-> id SMALLINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
-> cname varchar(10) NOT NULL,
-> pid SMALLINT UNSIGNED,
-> FOREIGN KEY(pid) references sheng(id));
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