SQL Server：如何返回每個過去6個月的值

Question

我有一個查詢，返回是否3列= 1，然後如果第二個表中存在ProviderID得分。我需要能夠使用Time_Stamp列的每個月爲6個月返回一個分數，不包括當前月份。下面將返回上個月的分數。我怎樣才能包括剩下的5個月和ROW_NUMBER()呢？

DECLARE @ProviderID int = '1717'; 

WITH cte as 
(
    SELECT TOP 1 
     a.ProviderID, Time_Stamp, 
     SUM(CASE WHEN [AdditionalReports] = '1' THEN 5 ELSE 0 END) as AdditionalReports, 
     SUM(CASE WHEN [UniqueReportRequests] = '1' THEN 15 ELSE 0 END) as UniqueReportsRequests, 
     SUM(CASE WHEN [SurveyCompleted] = '1' THEN 30 ELSE 0 END) as SurveyCompleted, 
     MAX(CASE WHEN b.ProviderID IS NULL THEN 0 ELSE 50 END) as SubscriptionExists 
    FROM 
     ProviderValueCard a 
    LEFT JOIN 
     SubscriptionsTV b ON a.ProviderID = b.ProviderID 
    WHERE 
     a.ProviderID = @ProviderID AND GroupID = 2 
     AND Time_Stamp BETWEEN DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) AND DATEADD(DAY, -(DAY(GETDATE())), GETDATE()) 
    GROUP BY 
     Time_Stamp, a.ProviderID, event 
    ORDER BY 
     event DESC, Time_Stamp DESC 
) 
SELECT 
    ProviderID, Time_Stamp, 
    (AdditionalReports + UniqueReportsRequests + SurveyCompleted + SubscriptionExists) AS TotalScore 
FROM 
    cte 

這裏是如何抓住前幾個月的第一/最後一天：

2個月前：

DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0) as FirstD2monthsago, 
     DATEADD(DAY, -DAY(GETDATE()), DATEADD(MONTH, -1, GETDATE())) AS last_day_2_months_ago 

3個月前等：

DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 3, 0) as FirstD3monthsago, 
     DATEADD(DAY, -DAY(GETDATE()), DATEADD(MONTH, -2, GETDATE())) AS last_day_3_months_ago 

所需的輸出

ProviderID Time_Stamp    TotalScore Row_Number 
----------- ----------------------- ----------- 
1717  2014-08-29 12:11:17.610 70    1 
1717  2014-07-29 12:11:17.610 95    2 
1717  2014-06-29 12:11:17.610 100    3 
1717  2014-05-29 12:11:17.610 70    4 
1717  2014-04-29 12:11:17.610 70    5 
1717            6 

Answer 1

DECLARE @ProviderID INT, @Now DATETIME, @Months INT 
SELECT @ProviderID = 1717, @Now = GETDATE(), @Months = 5 

WITH 
date_range_cte AS (
    SELECT 1 AS RowNum, DATEADD(mm,-1,@Now) AS StartDate, DATEADD(mm,0,@Now) AS EndDate 
    UNION ALL 
    SELECT d.RowNum + 1 AS RowNum, DATEADD(mm,(-d.RowNum - 1),@Now) AS StartDate, DATEADD(mm,-d.RowNum,@Now) AS EndDate 
    FROM date_range_cte d 
    WHERE d.RowNum + 1 <= @Months 
    ), 
    main_cte AS (
      SELECT 
      ROW_NUMBER() OVER (PARTITION BY a.ProviderID, d.RowNum, d.StartDate ORDER BY Time_Stamp DESC) AS ordinal_position, 
      a.ProviderID, 
      d.RowNum, 
      d.StartDate, 
      [AdditionalReports] * 5 AS AdditionalReports, 
      [UniqueReportRequests] * 15 AS UniqueReportsRequests, 
      [SurveyCompleted] * 30 as SurveyCompleted, 
      CASE WHEN b.ProviderID IS NULL THEN 0 ELSE 50 END as SubscriptionExists 
      FROM ProviderValueCard a 
      INNER JOIN date_range_cte d ON d.StartDate < Time_Stamp AND Time_Stamp <= d.EndDate 
      LEFT OUTER JOIN SubscriptionsTV b ON a.ProviderID = b.ProviderID 
      WHERE a.ProviderID = @ProviderID AND GroupID = 2 
      ) 
     SELECT ProviderID, RowNum, StartDate, (AdditionalReports + UniqueReportsRequests + SurveyCompleted + SubscriptionExists) AS TotalScore 
     FROM main_cte 
     WHERE ordinal_position = 1 
     ORDER BY RowNum 

Answer 2

這裏有幾種方法（psuedocode）：

1 - 爲每個想要獲得的月份製作一個cte，就像您現有的cte一樣。你需要在每一個改變的唯一事情是這一行：

AND Time_Stamp BETWEEN DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) AND DATEADD(DAY, -(DAY(GETDATE())), GETDATE()) 

2個月前，你將它改成這樣：

AND Time_Stamp BETWEEN DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0) AND DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) 

等爲其他月份回來。

2 - 參考上述cte中的同一行，將其更改爲-6以獲取過去6個月的數據。然後在您的選擇列表中包含一個MONTH（TimeStamp）列，並按它分組，以在過去6個月內每月獲得一行。