数据库报错Cannot delete or update a parent row: a foreign key constraint fails
（1）SQL语句 （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
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相关文章
- 1. MySQL Cannot delete or update a parent row: a foreign key constraint fails
- 2. MySQL错误号1451-Cannot delete or update a parent row: a foreign key constraint fails
- 3. Mysql Reference Constraint -ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key
- 4. 关于mysql中[Err] 1451 -Cannot delete or update a parent row: a foreign key constraint fails
- 5. ERROR 1217 (23000) at line 730: Cannot delete or update a parent row: a foreign key constraint fails
- 6. Cannot add or update a child row: a foreign key constraint fails mysql报：1452
- 7. ERROR 1452 : Cannot add or update a child row: a foreign key constraint fails
- 8. Cannot add or update a child row: a foreign key constraint fails 解决办法
- 9. Error Code: 1452 Cannot add or update a child row: a foreign key constraint fails
- 10. [Err] 1452-Cannot add or update a child row: a foreign key constraint fails(......)