mysql查询从下表中获取收入，成本和利润：

Question

我在数据库中有以下表格，我需要计算收入（所有订单的售价总和），成本（所有销售产品的所有成本之和）和利润（收入减去成本）< / p>

• sales_order的

     id 
     grand_total (sum of sell_price of its items)
     order_status (pending/complete)
     delivery_date (date)
  

• sales_order_item

  id
  sales_order_id
  product_id (unique)
  quantity (ordered quantity)
  sell_price (sell price for single item)
  

• PURCHASE_ORDER

  id
  status (pending / approved)
  

• purchase_order_items

  id
  purchase_order_id
  product_id
  cost  (cost of each item)
  

Answer 1

加入sales_order_item表格，明确了purchase_order_items表格中的费用和产品，假设cost在purchase_orders之间不同时间。如果成本发生了变化，那么这可能会有点难看。

SELECT sum(sell_price*quantity) as revenue, sum(cost*quantity) as cost, sum(sell_price)-sum(cost*quantity) as profit
FROM sales_order_item 
    INNER JOIN (SELECT distinct cost, product_id FROM purchase_order_items) as product 
        ON sales_order_item.product_id = product.product_id