看了以前的贴子 有人做的

select price_market-price_member as 节省,price,id from ks_product

但是一调用整张表的数据都出来了  怎么针对当前商品调出数据呢？

可以了

select price_market-price_member as 节省,price,id from ks_product where id={$CurrInfoID}