删除外键：
alter table `itrip_shop` drop FOREIGN KEY `FK_ayixnihiit0pouq70l8ig0ax9`;
删除唯一键：
alter table `itrip_shop` drop index `UK_ayixnihiit0pouq70l8ig0ax9`;
添加外键约束（复杂选项版）：
alter table `itrip_shop` ADD CONSTRAINT `FK_ayixnihiit0pouq70l8ig0ax9` FOREIGN KEY `FK_ayixnihiit0pouq70l8ig0ax9` (`shop_admin`) REFERENCES `itrip_user` (`user_id`);
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