mysql uodate 报错 You can't specify target table '**' for update in FROM clause

You can‘t specify target table ‘sc‘ for update in FROM clause

背景：把“sc”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩；

上面的sql是我写的，执行就报这个错，这个原因说的是不能从自己表里查数据再更新自己

解决方法：嵌套一层中间表

update sc set sc.score =
(select t1.score from (select avg(sc1.score) score from sc sc1 where sc1.c_id=(select course.c_id from teacher,course where course.t_id=teacher.t_id and tname=‘叶平‘)) t1)
where sc.c_id = (select course.c_id from teacher,course where course.t_id=teacher.t_id and tname=‘叶平‘);

这种问题仅存在于mysql中，在Oracle中是不存在的，因此在此打个mark 以防下次又忘记了

mysql uodate 报错 You can't specify target table '**' for update in FROM clause

原文地址：https://www.cnblogs.com/zhaiyt/p/10475173.html

时间： 2024-08-07 02:16:50

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