如果前两个月有订单，如何添加后两个月的中心

Question

我的经理要我统计每个有订单的中心。如果中心在过去两个月内下达了一个订单，则该中心在下达订单当月起的接下来两个月内被视为活跃。示例：如果中心“AR238”在二月份下了订单，那么该订单将被视为在接下来的两个月内有效。因此，如果三月或四月没有再下订单，它会一直活跃到四月。我正在尝试计算每个月每个活跃中心的数量，并与前几个月相结合。因此，如果一个中心在二月份下了订单，我需要能够计算二月、三月和四月的订单。请协助如何做到这一点。

SELECT DateName( month , DateAdd( month , MONTH(dmeorderdate) , 0 ) - 1 ) as Month, count(distinct 
DmeOrderNumberDisplay) as NPWT_Order_Volume,  count(distinct CenterCode) as NPWT_Active_Centers
FROM [AtHome].[Reporting].[WoundQOrderDetails] w
left join[AtHome].[Reporting].[DimCenter] c on c.CenterSK = w.CenterSK
where DmeOrderDate between '2024-01-01' and GETDATE()
and DmeSignedByProvider = 1
and OrderType = 'NPWT'
and CenterCode is not null
group by DateName( month , DateAdd( month , MONTH(dmeorderdate) , 0 ) - 1 ),MONTH(dmeorderdate)
order by MONTH(dmeorderdate)

Answer 1

要计算每个月的每个活跃中心，并与前几个月进行复合，您可以使用窗口函数和条件聚合的组合。这是更新的查询：

WITH ActiveCenters AS (
  SELECT 
    CenterCode,
    DATEADD(mm, 2, DATE_TRUNC('month', dmeorderdate)) AS ActiveUntil
  FROM 
    [AtHome].[Reporting].[WoundQOrderDetails] w
  LEFT JOIN 
    [AtHome].[Reporting].[DimCenter] c ON c.CenterSK = w.CenterSK
  WHERE 
    DmeOrderDate BETWEEN '2024-01-01' AND GETDATE()
    AND DmeSignedByProvider = 1
    AND OrderType = 'NPWT'
    AND CenterCode IS NOT NULL
)
SELECT 
  DATE_NAME(month, DATEADD(month, MONTH(a.ActiveUntil), 0) - 1) AS Month,
  COUNT(DISTINCT a.CenterCode) AS NPWT_Active_Centers
FROM 
  ActiveCenters a
  CROSS JOIN (
    SELECT DISTINCT DATE_TRUNC('month', dmeorderdate) AS Month
    FROM 
      [AtHome].[Reporting].[WoundQOrderDetails]
    WHERE 
      DmeOrderDate BETWEEN '2024-01-01' AND GETDATE()
  ) m
WHERE 
  a.ActiveUntil >= m.Month
GROUP BY 
  DATE_NAME(month, DATEADD(month, MONTH(a.ActiveUntil), 0) - 1)
ORDER BY 
  MONTH(a.ActiveUntil)