Elseif hjælp?

Hej eksperter.

Jeg har et script som sletter i en database.
Men jeg skal have den til at skrive hvis der intet er i min database så skal den echo "No"; feks.

det ser sådan ud:

<?php
          require "db.php";
               
    if(isset($_GET['id']))
    {
        mysql_query("DELETE FROM xxx WHERE id='". $_GET["id"] ."'") or die(mysql_error());

        echo "<center><b><font face=Verdana size=1>xxx blev slettet!</font></b><br><br></center>";
    }
elseif (!$_GET['id'])  {
    echo "No";
  }


    echo "<table>\n";

    $res = mysql_query("SELECT * from xxx ORDER BY xxxASC");

    while($row = mysql_fetch_array($res))
    {
echo"<table width='100%' height='85' border='0' cellpadding='0' cellspacing='0'>
  <tr>
    <td width='89' height='67' rowspan='5'> <p><img src='$row[xxxx]' width='85' height='92'>
      </p></td>
    <td width='177'>xxx: </td>
    <td width='759'><strong> $row[xxx] </strong></td>
    <td width='17' rowspan='5'><a href='?id=$row[xxx]'><img src='../gfx/deleted.gif' width='17' height='16' border='0'></a>&nbsp;</td>
  </tr>
  <tr>
    <td>xxx:</td>
    <td><strong>$row[xxxx] </strong></td>
  </tr>
  <tr>
    <td valign='top'>xxx:</td>
    <td valign='top'><strong>$row[xxxx] </strong></td>
  </tr>
  <tr>
    <td>xxxx:</td>
    <td rowspan='2' valign='top'><strong>$row[xxx] </strong></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td colspan='4'>&nbsp;</td>
  </tr></td>";
          }
echo "</table>";
?>