Question

如何在单个查询中组合SUM和MAX？

假设我有一个订单规则：

ProductID \ Quantity

我可以说：

Select ProductID,SUM(Quantity) AS Sold 
FROM Orderrule 
GROUP BY ProductID
ORDER BY SUM(Quantity) Desc

然而，这将返回所有销售，而不仅仅是最畅销的产品（数量）。

Answer 1

试试这个

SELECT TOP(1)
*
FROM
(
    Select 
        ProductID,
        MAX(Quantity) As MaxQuantity,
        SUM(Quantity) AS Sold 
    FROM Orderrule 
    GROUP BY ProductID    
)AS X
ORDER BY Sold DESC

Answer 2

SELECT TOP 1 ProductID, Sold FROM
(
  SELECT ProductID, SUM(Quantity) AS Sold
  FROM Orderrule
  GROUP BY ProductID
) totals
ORDER BY Sold DESC

Answer 3

所以有两种方法可以做到 - 首先要限制结果数量，例如：

select * from (your_select) where rownum = 1

另一个是选择具有最高值的那个，这将需要一个子选择，如：

having sum(quantity) = 
  (select max(sum_quan) from (select sum(Quantity) from orderrule group by Product_id))

SQL查询：SELECT MAX SUM数量

3 个答案: