order by pid desc加到这个语句的那个位置？该怎么处理

order by pid desc加到这个语句的那个位置？

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php $sql = "SELECT `subject`, `author`, `fid` ,`first`,`tid`,`pid`  FROM `forum_post` WHERE 1 "; $result = mysql_query($sql) or die("查询失败!");     $number = 6; while ($row=mysql_fetch_array($result))  {     if ($row['fid'] ==56 && $row['first'] !=0 && $number != 0)     {         ?>         <tr>            <td><a href="message/mes.php?id=<?php%20echo%20%24row%5B'pid'%5D;?>"><h3>            <?php echo substr($row['subject'],0,64);$number--;?>
</h3></a></td>               <td><a href="message/mes.php?id=<?php%20echo%20%24row%5B'pid'%5D;?>"><h3>            <?php echo substr($row['author'],0,16);?>
</h3></a></td>        </tr>        <?php }}?>

order by pid desc加到这个语句的那个位置？
$sql = "SELECT `subject`, `author`, `fid` ,`first`,`tid`,`pid` FROM `forum_post` WHERE 1 ";
我试了好几个地方都报错。
我需要让他降序排列

------解决方案--------------------
WHERE 1 之后
------解决方案--------------------
SELECT `subject`, `author`, `fid` ,`first`,`tid`,`pid` FROM `forum_post` WHERE 1
order by pid desc
------解决方案--------------------
语句最后，limit之前