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MySQL 1091 can‘t drop check that column/key exists
source link: https://segmentfault.com/a/1190000039682297
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大致报错内容
MySQL 1091 can't drop check that columnkey exists
在navicat中创建外键时报错（想为myorder表创建外键userId，关联user表的主键userId）
关于navicat创建外键具体步骤，参见此文：navicat 数据表添加外键
可能的原因（任意一个）
1.myorder表没有创建字段userId
2.myorder表刚创建完，虽然有字段userId，但是还没保存myorder表，就立马去设置外键。
创建完myorder表后（记得要先创建userId字段），保存好。再为myorder表添加外键。
[[Err] 1091](http://t.zoukankan.com/hzcya1...
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