此问题只出现在mysql中 oracle中无此问题

在同一语句中,当你在select某表的数据后,不能update这个表,如:

DELETE FROM tbl_students WHERE id NOT IN (SELECT id FROM tbl_students GROUP BY `name`)

改成下面这样

DELETE FROM tbl_students WHERE id NOT IN (
SELECT t.id FROM
(SELECT id FROM tbl_students GROUP BY `name`)AS t)

将select出的结果再通过中间表select一遍就可以了

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