https://blog.csdn.net/jiangyu1013/article/details/79108498

報錯如題，意思大致是：在一條 sql 語句中不能先查出來部分內容，再同時又對當前表作修改。

解決方法：給查詢加別名，用中間表來實現不是對同一表作操作。

如錯誤定法：

UPDATE appbricks_department
SET rank = ‘2’
WHERE parent_id in (SELECT id FROM appbricks_department WHERE parent_id IS NULL) ;
改後的寫法：

UPDATE appbricks_department
SET rank = ‘2’
WHERE parent_id in
(SELECT * FROM (SELECT id FROM appbricks_department WHERE parent_id IS NULL) a );

作者：微風–輕許–
來源：CSDN
原文：https://blog.csdn.net/jiangyu1013/article/details/79108498
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