数据库报错Cannot delete or update a parent row: a foreign key constraint fails

企业开发 2020-01-17 10:58:07 阅读次数: 0

（1）SQL语句
在这里插入图片描述
（2）表的关系图

存在问题：
无法删除或更新父行：外键约束失败

原因：存在外键约束

存在外键约束的规则：

（1）级联删除，就是删除主键表的同时，外键表同时删除。

（2）、约束/限制当在主键表中删除对应记录时，首先检查该记录是否有对应外键，如果有则不允许删除。（即外键表约束主键表）

（3）SET NULL当取值为Set Null时，则当在主键表中删除对应记录时，首先检查该记录是否有对应外键，如果有则设置子表中该外键值为null（，一样是外键表约束主键表，不过这就要求该外键允许取null）。

解决方法
先关闭外键约束，执行删除操作，然后再开启外键约束
在这里插入图片描述

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转载自blog.csdn.net/weixin_40486955/article/details/104011048

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