删除不区分大小写的mysql语句在php页面中不起作用

我用这段代码来删除2表中的match Tweep，现在我的问题是当我执行php时，它只删除1个raw，它应该删除5个raw，不区分大小写，我尝试在PMA中执行相同的sql语句，它工作正常，并删除所有match Tweep，当我执行php页面时，有没有线索说明为什么会发生这种情况

<?php
include "dbconnect.php";
mysql_select_db("sdntweep_tweeps", $con);
mysql_query (" DELETE FROM tweeps WHERE screenname IN (SELECT LOWER (screenname) FROM non_sudanese ");
echo " done"
?>

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您的子查询中缺少一个关闭参数：

mysql_query (" DELETE FROM tweeps WHERE screenname IN ".
     "(SELECT LOWER (screenname) FROM non_sudanese ) "); //<-- at the end, 
      // it wasn't there before

---

您的SQL语法中有一个错误：

mysql_query (" DELETE FROM tweeps WHERE screenname IN (SELECT LOWER (screenname) FROM non_sudanese ");

应该是

mysql_query (" DELETE FROM tweeps WHERE screenname IN (SELECT LOWER (screenname) FROM non_sudanese )");

注意额外的）

mysql_query (" DELETE FROM tweeps WHERE screenname IN (SELECT LOWER (screenname) FROM non_sudanese )");