數據庫報錯Cannot delete or update a parent row: a foreign key constraint fails
（1）SQL語句 （2）表的關係圖 存在問題： 無法刪除或更新父行：外鍵約束失敗 原因：存在外鍵約束 存在外鍵約束的規則： （1）級聯刪除，就是刪除主鍵表的同時，外鍵表同時刪除。 （2）、約束/限制當在主鍵表中刪除對應記錄時，首先檢查該記錄是否有對應外鍵，如果有則不允許刪除。（即外鍵表約束主鍵表） （3）SET NULL當取值爲Set Null時，則當在主鍵表中刪除對應記錄時，首先檢查該記錄是否有
相關文章
- 1. MySQL Cannot delete or update a parent row: a foreign key constraint fails
- 2. MySQL錯誤號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. 關於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報：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 解決辦法
- 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(......)
- 更多相關文章...
- • SQL FOREIGN KEY 約束 - SQL 教程
- • MySQL外鍵約束（FOREIGN KEY） - MySQL教程
- • Flink 數據傳輸及反壓詳解
- • TiDB 在摩拜單車在線數據業務的應用和實踐
相關標籤/搜索
每日一句
-
每一个你不满意的现在，都有一个你没有努力的曾经。
歡迎關注本站公眾號,獲取更多信息
相關文章
- 1. MySQL Cannot delete or update a parent row: a foreign key constraint fails
- 2. MySQL錯誤號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. 關於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報：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 解決辦法
- 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(......)