public function sqlPagination()
    {
        $pager = $this->pagination();
        if (!$pager instanceof DatabasePagination) {
            $pager = $this->createPagination($pager->data());
        }

        $sql = $pager->sql();
        if (strlen($sql) > 0) {
            $sql = ' '.$sql;
        }

        return $sql;
    }