7-Tage-Durchschnitt in SQL Server 2014

Question

Ich muss die folgende T-SQL-Anweisung ändern, um einen rollierenden 7-Tage-Durchschnitt des Umsatzes zu enthalten.

Was muss ich in den folgenden Code aufnehmen, um das zu erreichen?

SELECT 
    CAST(create_dtg AS DATE) DATE, 
    SUM([agent_rev] + [anchor_rev] + [corp_rev] + [offsite_rev]) AS RevenueTotals, 
    SUM([media_est_cost] + [other_cost]) AS COSTTOTALS 
FROM 
    [dbo].[dw_rpt_traffic] 
WHERE 
    [create_dtg] >= (Getdate() - 90) 
--GROUP BY CREATE_DTG 
--ORDER BY CREATE_DTG ASC 

Ich habe auch versucht, Partion durch, aber dies gibt den gleichen Wert wie die Revenuetotals.

Select a.dte, a.revenuetotals, a.COSTTOTALS, AVG(A.RevenueTotals) OVER  (PARTITION BY a.dte ORDER BY a.dte ROWS 7 PRECEDING) as Day7Avg 
from 
(
    select CAST(CREATE_DTG AS DATE) as dte, 
      SUM([AGENT_REV]+[ANCHOR_REV]+[CORP_REV]+[OFFSITE_REV]) as RevenueTotals, 
      SUM([MEDIA_EST_COST]+[OTHER_COST]) as COSTTOTALS 
    FROM [dbo].[dw_rpt_traffic] 
    where [CREATE_DTG] >= (GetDate() - 90) 
    GROUP BY CREATE_DTG 
    ) as A 
Group by a.dte, a.revenuetotals, a.COSTTOTALS 
order by a.dte 

Danke, Karen

Answer 1

Für Aggregate rollen typischerweise ich eine OVER Klausel mit ROWS [...] PRECEDING [...] verwenden.

WITH cte 
      AS (SELECT x.Date 
         ,x.Revenue 
         ,AVG(x.Revenue) OVER (ORDER BY x.Date 
               ROWS BETWEEN 6 PRECEDING AND CURRENT ROW 
         ) AS [MA7] 
       FROM  (SELECT CAST(t.Date AS DATE) AS [Date] 
            ,SUM(t.Revenue) AS [Revenue] 
          FROM  #tmp t 
          WHERE  CAST(t.Date AS DATE) > CAST(GETDATE() - 96 AS DATE) 
          GROUP BY CAST(t.Date AS DATE) 
         ) x 
      ) 
    SELECT c.Date 
      ,c.Revenue 
      ,c.MA7 
    FROM cte c 
    WHERE c.Date > CAST(GETDATE() - 90 AS DATE) 
    ORDER BY c.Date; 

---

Die obige Tabelle wurde mit der folgenden generiert:

IF (OBJECT_ID('tempdb..#tmp') IS NOT NULL) 
    DROP TABLE #tmp; 
CREATE TABLE #tmp 
    (
    [Date] DATETIME 
    ,[Revenue] DECIMAL(18, 2) 
    ); 
-- 
DECLARE @first INT = 0 
    ,@last INT = 200; 
WHILE @first < @last 
    BEGIN 
     INSERT INTO #tmp 
       (Date, Revenue) 
     VALUES (GETDATE() - @first * 0.5, RAND() * 100000); 

     SET @first = @first + 1; 
    END; 

Answer 2

Wahrscheinlich nutzt der einfachste Weg outer apply:

with rt as (
     select CAST(CREATE_DTG AS DATE) as dte, 
       SUM([AGENT_REV]+[ANCHOR_REV]+[CORP_REV]+[OFFSITE_REV]) as RevenueTotals, 
       SUM([MEDIA_EST_COST]+[OTHER_COST]) as COSTTOTALS 
     from [dbo].[dw_rpt_traffic] 
     where [CREATE_DTG] >= (GetDate() - 90) 
    ) 
select rt.*, rolling.avgrt 
from rt outer apply 
    (select avg(rt2.RevenueTotals) as avgrt 
     from rt rt2 
     where rt2.dte >= dateadd(day, -6, rt.dte) and 
      rt2.dte <= rt.dte 
    ) rolling 
order by dte;