mysql报错Error Code: 1022. Can't write; duplicate key in table `xxx`
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说明：此错误是外键名称重复了，文章：数据库查看所有外键，验证某外键是否已经存在（mysql）
查找重复外键名称，哪里被用到了，sql如下：
select * from INFORMATION_SCHEMA.KEY_COLUMN_USAGE where CONSTRAINT_NAME='重复的外键名称'
如果没问题，则重新命名即可
感谢
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