Display Recent Comments in Wordpress

global $wpdb;
$sql = "SELECT DISTINCT ID, post_title, post_password, comment_ID,
comment_post_ID, comment_author, comment_date_gmt, comment_approved,
comment_type,comment_author_url,
SUBSTRING(comment_content,1,30) AS com_excerpt
FROM $wpdb->comments
LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID =
$wpdb->posts.ID)
WHERE comment_approved = '1' AND comment_type = '' AND
post_password = ''
ORDER BY comment_date_gmt DESC
LIMIT 10";
$comments = $wpdb->get_results($sql);
$output = $pre_HTML;
$output .= "n

";
foreach ($comments as $comment) {
$output .= "n
• ".strip_tags($comment->comment_author)
  .":" . "ID) .
  "#comment-" . $comment->comment_ID . "" title="on " .
  $comment->post_title . "">" . strip_tags($comment->com_excerpt)
  ."

";
}
$output .= "n

";
$output .= $post_HTML;
echo $output;?>