MySQL データベースから HTML テーブルの行を動的に並べ替える方法

<th><a href="mypage.php?sort=type">Type:</a></th>
<th><a href="mypage.php?sort=desc">Description:</a></th>
<th><a href="mypage.php?sort=recorded">Recorded Date:</a></th>
<th><a href="mypage.php?sort=added">Added Date:</a></th>

<?php
$sql = "SELECT * FROM MyTable";

switch ($_GET['sort']) {
    case 'type':
        $sql .= " ORDER BY type";
        break;
    case 'desc':
        $sql .= " ORDER BY Description";
        break;
    case 'recorded':
        $sql .= " ORDER BY DateRecorded";
        break;
    case 'added':
        $sql .= " ORDER BY DateAdded";
        break;
}