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

mysql查询从下表中获取收入，成本和利润：

1 个答案: