MySQL之外键、主键、自增

1、创建外键

create table userinfo(
　　uid int auto_increment primary key,
　　name varchar(32),
　　department_id int,
　　xx_id int,
　　constraint fk_user_depar foreign key (“department_id”) references color(“id”)
)engine=innodb default charset=utf8; 

create table department( 　　
　　id bigint auto_increment primary key, 　　
　　title char(15) 
)engine=innodb default charset=utf8;

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