计算同一行中的每月和最后十二个日期

Question

我有 table 销售额

Activity | Sector | dateSale | Amount
CREATE TABLE sales
(Activity nvarchar(100) ,
Sector    nvarchar(100) ,
dateSale  date ,
Amount as float )

我需要在同一行中计算每月和最后一个月的十二个日期：预期结果例如：

Activity | Sector | AmountMonth | AmountLTD

我试着计算一个月的金额

declare @date as date,
set @date ='17-11-2020'----- I should to calculate amount in the previous month of the date parameter: all october for the same year 
SELECT SUM(Amount)
      ,Activity
      ,Sector 
FROM sales
WHERE [dateSale] between DATEADD(MONTH, DATEDIFF(MONTH, 0, @date)-1, 0)
                     and DATEADD(MONTH, DATEDIFF(MONTH, -1, @date)-1, -1)
group by Activity
        ,Sector

我试图计算 LTD 中的金额但是它是错误的，我需要更正它：

 declare @date as date,
    set @date ='17-11-2020'----- I should to calculate amount in the ltd of the date parameter Ineed to calculate from november 2019 to october 2020
    SELECT SUM(Amount)
          ,Activity
          ,Sector 
    FROM sales
    WHERE [dateSale] between DateAdd(DAY,-Day(@Date)+1,@Date)
                         and DateAdd(MONTH,-13,@DateR2)
    group by Activity
            ,Sector

请问如何在预期的同一行中进行计算？有没有其他简单的计算方法？

Answer 1

如果您想要每个月的金额以及后面 12 个月的金额，那么您需要分别计算总和。从您的问题中不清楚您想要输出的确切方式，但希望以下内容会有所帮助。它计算内部查询中每个月的总和，并在外部查询中附加尾随的 12。

SELECT s.Activity, s.Sector, s.StartOfMonth, s.AmountMonth, SUM(salesLtd.Amount) [AmountLTD]
FROM (
    SELECT Activity, Sector, SUM(Amount) [AmountMonth], StartOfMonth
    FROM sales 
    CROSS APPLY (SELECT DATEADD(month, DATEDIFF(month, 0, dateSale), 0) [StartOfMonth]) [forStart]
    GROUP BY Activity, Sector, StartOfMonth
) s
INNER JOIN sales salesLtd ON salesLtd.dateSale <= EOMONTH(s.StartOfMonth) 
    AND salesLtd.dateSale >= DATEADD(year, -1, s.StartOfMonth)
GROUP BY s.Activity, s.Sector, s.StartOfMonth, s.AmountMonth

我本可以使用 CTE 构建内部查询，然后在外部查询的连接中使用相同的 CTE（大概是为了利用已经聚合的数据），但我怀疑它实际上会更慢。

计算同一行中的每月和最后十二个日期

calculate monthly and twelve last date in the same row

sql

sql-server

sql-server-2012