MYSQL delete語句不支援别名？

  有一個表的資料比較大，然後需要進行關聯删除，删除的時候發現如下SQL報錯：

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1. 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：

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1. Error Code: 1064
2. 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

開始以為是exists的問題，于是更改成in再測試，也報同樣錯：

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1. 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;

将别名去掉就可以了，将上面兩個報錯的SQL更改成如下形式就可以了：

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1. DELETE FROM test.test1 WHERE recordid IN (SELECT smsInfoID FROM test.test2 WHERE receiveTime <= "2011-10-09 00:00:00") LIMIT 1000;
2. 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;

下面支援别名的文法：

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1. DELETE test.a 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;