ต้องการเลือกข้อมูลที่ซ้ำกันมาแสดงเพียงแค่ 1 เขียนโค้ดอย่างไรคับ

<?
include 'connect.php';
$productname=$_GET[name_prd];
?>
<table width="900" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td align="left" valign="top" bgcolor="#FFFFFF"><table width="900" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td width="200" align="left" valign="top"><? include('menu.php'); ?></td>
        <td width="615" align="left" valign="top"><table width="600" border="0" align="center" cellpadding="0" cellspacing="0">
          <tr>
            <td height="200" valign="top"><table width="100%"  border="0" cellspacing="4">
      <?
	
	$sql="select * from product  where name_prd='$productname' ";
	$result=mysql_db_query($dbname,$sql);
	while ($rs=mysql_fetch_array($result)) {
		$id_prd=$rs[id_prd];
		$code=sprintf("%05d",$id_prd);
		$name_prd=$rs[name_prd];
		$detail_prd=$rs[detail_prd];
		$ref_id_type=$rs[ref_id_type];
		$price_prd=$rs[price_prd];
		$photo_prd=$rs[photo_prd];

		if ($photo_prd=="") {
			$photo_prd="temp.jpg";
		}
		echo "<TR>
						<TD WIDTH='50%' VALIGN='top'> 
							</B>$name_prd <BR>$detail_prd
							
						</TD>
						<TD WIDTH='50%' VALIGN='top'> 
							
							
							
							</TD>
					</TR>";
	}
?>
    </table>&nbsp;</td>
          </tr>
        </table></td>
      </tr>
    </table>
      <? include('footer.php'); ?></td>
  </tr>
</table>