php+mysql如何实现库存加权平均单价？急急！！！在线等。
mysqlphp
各位高手：
大家好！请帮忙实现用PHP+MYSQL实现库存加权平均单价。我现在需要求当月存货单价，当月存货单价=(月初库存存货的实际金额+（本月进货实际单价*本月进货数量）)/(月初库存存货数量+本月进货数量).以下是三个表，一个是产品表cxh_product(id,code编码,p_name名称)，一个是入库表storage(product_id,qty,price,total,stockage_date)，一个是出库表
stockout(product_id,qty,stockout_date)。
请帮忙解决，急急。。。
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