Mine

          $sql = 'SELECT p.uid, u.name, p.points                  FROM {userpoints} p                  INNER JOIN {users} u USING (uid)';          if ( $delta == 0 ) {            $sql .= ' WHERE p.tid = 0 OR p.tid IS NULL ';            $result = db_query_range($sql, 0, $num);          }           else {            $delta = 5;            $sql .= ' WHERE p.tid = %d';            $result = db_query_range($sql, 0, $num, $delta);          }