MySQL Cannot delete or update a parent row: a foreign key constraint fails

原因：外键关联

一下代码查询外键：

select

TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME

from INFORMATION_SCHEMA.KEY_COLUMN_USAGE

where CONSTRAINT_SCHEMA =‘数据库名称‘ AND

REFERENCED_TABLE_NAME = 表名称;

先解除外键即可。

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修改、删除表时候提示MySQL Cannot delete or update a parent row: a foreign key constraint fails