4ed6d15a59
折扣精确到 product_id（discount_detail.productid），三类折扣取最优惠(min)： - 客户折扣 get_min_product_discount(pid, resellerid, customerid) - 分销商折扣 get_min_distributor_discount(pid, resellerid, distributorid) - 供应商折扣 get_min_supplier_discount(pid, resellerid, supplierid) resellerid=product.org_id, supplierid=product.providerid, distributorid 从 discount_customer_bind 按 customerid 查。