时间:2021-07-01 10:21:17 帮助过:2人阅读
注意语句中的(`)全部是Esc下面那个键而非单引号!执行语句时是单引号。
alter table t_book add constraint `fk` foreign key (`bookTypeId`) references t_booktype(`id`);
或者在创表时直接加上
CREATE TABLE t_book(
id int primary key auto_increment,
bookName varchar(20),
author varchar(10),
price decimal(6,2),
bookTypeId int,
constraint `fk` foreign key (`bookTypeId`) references `t_bookType`(`id`)
);
mysql添加外键语句
标签:pre arch mysql body log table const 约束 bsp