SELECT A.idx, A.p_name, A.memo2, A.p_image, A.cat_code, A.cat_no, A.etc_1, B.re_name, B.width, B.height FROM tbl_product A LEFT JOIN tbl_product_files B ON A.idx=B.b_idx WHERE main_show='Y' and A.cat_code like '11/19/%' group by A.idx order by A.sort_num DESC, A.idx DESC limit 20