You can't specify target table 't_open_user' for update in FROM clause

https://blog.youkuaiyun.com/jiangyu1013/article/details/79108498

报错如题，意思大致是：在一条 sql 语句中不能先查出来部分内容，再同时又对当前表作修改。

解决方法：给查询加别名，用中间表来实现不是对同一表作操作。

如错误定法：

UPDATE appbricks_department
SET rank = ‘2’
WHERE parent_id in (SELECT id FROM appbricks_department WHERE parent_id IS NULL) ;
改后的写法：

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

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作者：微风–轻许–
来源：优快云
原文：https://blog.youkuaiyun.com/jiangyu1013/article/details/79108498
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