select u_mtrl_price.mtrlid, u_mtrl_price.name as mtrlname, ISNULL(u_mtrl_price_pricelist.price, 0) AS pricelistprice from u_mtrl_price LEFT JOIN u_mtrl_price_pricelist ON u_mtrl_price.mtrlid = u_mtrl_price_pricelist.mtrlid where u_mtrl_price.mtrltype = 2 u_mtrl_price_pricelist.pricelistid = @arg_pricelistid