根據另一列的總和選擇列

Question

讓我說我有

SalesManagerId, SaleAmount, ProductId

我想總結每個SaleAmount （ SalesManagerId ， ProductId ）並使用最大sum(SaleAmount)獲取ProductId 。

這可能在一個查詢中？

例：

1, 100, 1
1, 200, 1
1, 600, 1
1, 400, 2
2, 100, 3
3, 100, 4
3, 100, 4
2, 500, 6
3, 100, 5

結果：

1, 900, 1
2, 500, 6
3, 200, 4

Answer 1

如果您有可用的分析函數，則可以使用RANK()

就像是：

SELECT SalesManagerId, ProductId, Total
FROM (
  SELECT SalesManagerId,
         ProductId, 
         SUM(SaleAmount) as Total,
         RANK() OVER(PARTITION BY SalesManagerId 
                     ORDER BY SUM(SaleAmount) DESC) as R
  FROM <Table name>
  GROUP BY SalesManagerId, ProductId) as InnerQuery
WHERE InnerQuery.R = 1

Answer 2

至少假設SQL 2005，你可以使用CTE ：

;with cteTotalSales as (
    select SalesManagerId, ProductId, SUM(SaleAmount) as TotalSales
        from YourSalesTable
        group by SalesManagerId, ProductId
),
cteMaxSales as (
    select SalesManagerId, MAX(TotalSales) as MaxSale
        from cteTotalSales
        group by SalesManagerId
)
select ts.SalesManagerId, ms.MaxSale, ts.ProductId
    from cteMaxSales ms
        inner join cteTotalSales ts
            on ms.SalesManagerId = ts.SalesManagerId
                and ms.MaxSale = ts.TotalSales
    order by ts.SalesManagerId

Answer 3

使用GROUP BY和ORDER：

SELECT SalesManagerId, SUM(SaleAmount) AS SaleSum, ProductId FROM [table-name] GROUP BY SalesManagerId, ProductId ORDER BY SaleSum DESC

Answer 4

非常好的問題！

試試這個：

SELECT MAX(SUM(SaleAmount)), ProductId GROUP BY SalesManagerId, ProductId;

或者

SELECT SUM(SaleAmount) as Sum, ProductId GROUP BY SalesManagerId, ProductId ORDER BY Sum DESC;

您不能只刪除sum列並僅獲取產品ID