Question

当前数据库：

tbl_Order：

ID.........UserName........date
1..........john............march 30 2017
2..........mike............march 31 2017

tbl_Products_In_Order

Order_ID.........Qty_Purchased........UnitPrice........TotalPrice
1...............2.....................1.00.............2.00
1...............3.....................2.00.............6.00
2...............1.....................8.00.............8.00

我需要输出：

Order_ID...UserName...date............Number_Of_Products.........Total_Qty_All
1..........John.......march 30 2017...2..........................5
2..........mike.......march 31 2017...1..........................1

有人可以帮我创建SQL查询吗？

Answer 1

这是一个PostgreSQL解决方案（但只使用基本的东西，所以在大多数SQL方言中应该相同或非常相似）：

SELECT
  Order_ID,
  UserName,
  date,
  count(Order_ID) AS Number_Of_Products,
  sum(Qty_Purchased) AS Total_Qty_All
FROM
  tbl_Products_In_Order AS pio
  INNER JOIN tbl_Order AS o ON pio.Order_ID = o.ID
GROUP BY Order_ID, UserName, date
ORDER BY Order_ID

SQL - 获取订单中的产品数量和总价值

1 个答案: