SQL Error : 1064 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 '-30,30' at line 1

select tbl_product.product_id, tbl_product.brief_vn, tbl_product.brief_en, tbl_product.content_vn, tbl_product.content_en, tbl_product.product_code, tbl_product.image, tbl_product.title_vn, tbl_product.title_en, product_board.board_id, product_board.rewrite_name, product_board.title_vn as board_namevn, product_board.title_en as board_nameen, product_board.brief_vn as board_briefvn, product_board.brief_en as board_briefen, tbl_supplier.title as supplier_name from tbl_product inner join product_board on tbl_product.board_id=product_board.board_id inner join tbl_supplier on tbl_product.supplier_id=tbl_supplier.supplier_id where (tbl_product.active=1) order by tbl_product.priority limit -30,30

Line : 23
File : /home/hmdtechc/public_html/template/product/detail.php