有一個表的數據比較大，然後需要進行關聯刪除，刪除的時候發現如下SQL報錯：
DELETE FROM test.test1 a WHERE EXISTS (SELECT 1 FROM test.test2 b WHERE a.recordID=b.smsInfoID AND b.receiveTime <="2011-10-09 00:00:00" ) limit 1000;
報錯如下：
Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a WHERE EXISTS (SELECT 1 FROM test.test2 b WHERE a.recordID=b.smsInf' at line 1 www.2cto.com
開始以為是exists的問題，於是更改成in再測試，也報同樣錯：
DELETE FROM test.test1 a WHERE a.recordid IN (SELECT b.smsInfoID FROM test.test2 b WHERE b.receiveTime <= "2011-10-09 00:00:00") LIMIT 1000;
原來是MYSQL的delete語句不支持別名！
將別名去掉就可以了，將上面兩個報錯的SQL更改成如下形式就可以了：
DELETE FROM test.test1 WHERE recordid IN (SELECT smsInfoID FROM test.test2 WHERE receiveTime <= "2011-10-09 00:00:00") LIMIT 1000; www.2cto.com
DELETE FROM test.test1 WHERE EXISTS (SELECT 1 FROM test.test2 WHERE test1.recordID=test2.smsInfoID AND test2.receiveTime <= "2011-10-09 00:00:00") LIMIT 1000;
作者 飛鴻無痕
