Cml\Db\Base::union PHP Метод

    public function union($sql, $all = false)
    {
        if (is_array($sql)) {
            foreach ($sql as $s) {
                $this->union .= $all ? ' UNION ALL ' : ' UNION ';
                $this->union .= $this->filterUnionSql($s);
            }
        } else {
            $this->union .= $all ? ' UNION ALL ' : ' UNION ';
            $this->union .= $this->filterUnionSql($sql) . ' ';
        }
        return $this;
    }