外键 最后设计 如何添加?
临时禁用外键检查(不推荐用于生产环境)外键检查会导致修改失败,外键字段,数据类型需要一致
SET FOREIGN_KEY_CHECKS = 0;
ALTER TABLE `basic`
ADD CONSTRAINT `fk_basic_user`
FOREIGN KEY (`operator_id`)
REFERENCES `user_info` (`user_id`)
ON DELETE RESTRICT
ON UPDATE CASCADE;
SET FOREIGN_KEY_CHECKS = 1;
operator_id user_id 类型必须一致