Wordpress: get term without links

gistfile1.txt

/**
* Getting taxonomy from DB without having links
* @param $post_id
* @return string "tag1,tag3,tag4"
*/
function go_get_terms($id){
  global $wpdb;
  $q     = 'SELECT * from wp_terms t LEFT JOIN wp_term_relationships r on r.term_taxonomy_id = t.term_id WHERE object_id = '.$id;
  $rows  = $wpdb->get_results($wpdb->prepare($q));
  $out   = ""; 
  foreach($rows as $row)
  {
    $out_str .= $row->name.',';
  }
  return substr($out_str,0,-1);
}