Error: cannot execute_db this query string! SELECT prod_id FROM tbl_product WHERE ( prod_cat_id like '10' or prod_cat_id like '10,%' or prod_cat_id like '%,10,%' or prod_cat_id like '%,10' or prod_cat_id like '10, %' or prod_cat_id like '% ,10, %' or prod_cat_id like '% ,10' ) GROUP BY prod_image_name ORDER BY prod_date_added desc, prod_id desc limit -20, 20 Reason You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-20, 20' at line 33