Question

我需要编写一个查询，以显示每年和每个公司的2个最大贵订单。

我尝试过：

SELECT CompanyName, DATEPART(YEAR, OrderDate) AS OrderYear, MAX(Freight)
FROM Orders, Shippers
WHERE Shippers.ShipperID = Orders.ShipVia
GROUP BY CompanyName, DATEPART(YEAR, OrderDate)

但是我只得到第一个，我怎么也能得到第二个？

Answer 1

您可以使用行号执行此操作：

SELECT *
FROM (
  SELECT CompanyName, DATEPART(YEAR, OrderDate) AS OrderYear, Freight,
       ROW_NUMBER() OVER (PARTITION BY CompanyName, DATEPART(YEAR, OrderDate)  ORDER BY Freight DESC) AS RN
  FROM Orders
  JOIN Shippers ON Shippers.ShipperID = Orders.ShipVia
) X
WHERE X.RN < 3

在SQL中使用GROUP BY选择2个最大值

1 个答案: