Mysql下SELECT的結果集作為UPDATE的WHERE條件時的SQL語法

這樣是不行的

UPDATE `table_name` SET `column_1` = value WHERE `column_2` IN (SELECT * FROM `table_name` WHERE `column` = value) 

必須得這樣：

UPDATE `table_name` AS alias_1 INNER JOIN (SELECT * FROM `table_name` WHERE `column` = value) AS alias_2 SET alias_1.column_1 = value WHERE alias_1.id = alias_2.id