利用新建一个表,直接把不重复的数据导入.

<?php  set_time_limit(13600);  //设置时间  $conn=mysql_connect('localhost','root',''); //连接数据库  mysql_select_db('shuju',$conn);  mysql_query("set names 'gbk'");     $query = mysql_query("select min(id) as mid from taobaoguanjianci group by title");       while($row = mysql_fetch_array($query))   {     mysql_query("INSERT into taobaoguanjiancitmp select id,cid,title,cat,level3,cname from taobaoguanjianci where id=$row[mid]");   }     ?>