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请在下面查看我的查询。现在它从 system_id = '$sid' 的联系人中查找 system_id 但我希望查询也从 system_id = '$sid' 的联系人中查找friend_id 

$tre = mysql_query("SELECT System_id, Full_name FROM accounts 
WHERE Full_name LIKE '". mysql_real_escape_string($_GET['q'])."%' LIMIT 5");
while($re=mysql_fetch_array($tre))
{
   $qry=mysql_query("SELECT System_id FROM contacts WHERE 
   System_id='". $sid ."' AND Friend_id='". $re['System_id'] ."'");
   if(mysql_num_rows($qry)>0){
      if($sid!=$re['user_id']){
         $obx['id']=$re['System_id'];
         $obx['name']=$re['Full_name'];
         $arr[]=$obx;
      }
   }

我该如何调整它？

谢谢！

更新：

在查找下面的一些评论后，我构建了这个按预期工作的查询：

SELECT DISTINCT contacts.friend_id, accounts.full_name, 
accounts.system_id
FROM contacts, accounts
WHERE (contacts.system_id = '$sid' AND contacts.friend_id 
= accounts.system_id) OR (contacts.friend_id = '$sid' 
AND contacts.system_id = accounts.system_id)

唯一的问题是如何从这里更改 SELECT 查询：

$tre = mysql_query("SELECT System_id, Full_name FROM accounts 
WHERE Full_name LIKE '". mysql_real_escape_string($_GET['q'])."%' LIMIT 5");

到$tre：

SELECT DISTINCT contacts.friend_id, accounts.full_name, 
accounts.system_id
FROM contacts, accounts
WHERE (contacts.system_id = '$sid' AND contacts.friend_id 
= accounts.system_id) OR (contacts.friend_id = '$sid' 
AND contacts.system_id = accounts.system_id)
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