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¿Cómo obtener el conteo de domingos de seis semanas usando Weekno en SQL Server 2008?

Si está buscando poder pasar cualquier valor de fecha para obtener los datos que cumplan con sus criterios, entonces para este tipo de PIVOT necesitará usar una solución SQL dinámica similar a esta:

DECLARE @cols AS NVARCHAR(MAX),
    @colsRollup AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX),
    @StartDate DateTime,
    @EndDate DateTime

Set @StartDate = '10-08-2012 00:00:00.000'
Set @EndDate = '11-18-2012 23:59:59.000'

select @cols = STUFF((SELECT ',' + QUOTENAME(WeekEnd) 
                    from
                    (
                      select DatePart(wk, I01.[SPGI01_CREATE_S]) WeekEnd
                      from [SUPER-G].[dbo].[CSPGI01_ASN_ACCURACY]
                      where I01.[SPGI01_CREATE_S] between @StartDate AND @EndDate
                    ) src
                    group by WeekEnd
                    order by WeekEnd desc
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

select @colsRollup = STUFF((SELECT ', Sum(' + QUOTENAME(WeekEnd) +') as WeekNo'+Cast(Weekend as varchar(2))
                    from
                    (
                      select DatePart(wk, I01.[SPGI01_CREATE_S]) WeekEnd
                      from [SUPER-G].[dbo].[CSPGI01_ASN_ACCURACY]
                      where I01.[SPGI01_CREATE_S] between @StartDate AND @EndDate
                    ) src
                    group by WeekEnd
                    order by WeekEnd desc
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = '
             SELECT case when InstanceType is not null then InstanceType else ''Sum'' End InstanceType ,  
                '[email protected]+',  max(InstanceDescription) AS InstanceDescription
             FROM
             (
               SELECT SPGI01_INSTANCE_TYPE_C as InstanceType,
                    InstanceDescription, ' + @cols + ' 
               from 
               (
                  SELECT I01.[SPGI01_INSTANCE_TYPE_C], 
                    DatePart(wk, I01.[SPGI01_CREATE_S]) WeekNo, 
                    DATEADD(DAY, 7 -DATEPART(WEEKDAY,I01.[SPGI01_CREATE_S]),  I01.[SPGI01_CREATE_S]) WeekEnd, 
                    J03.SPGJ03_MSG_TRANSLN_X InstanceDescription  
                  FROM [SUPER-G].[dbo].[CSPGI01_ASN_ACCURACY] I01  
                  INNER JOIN [SUPER-G].[dbo].[CSPGI50_VALID_INSTANCE_TYPE] I50 
                    ON I50.[SPGI50_INSTANCE_TYPE_C] = I01.[SPGI01_INSTANCE_TYPE_C]  
                  LEFT JOIN CSPGJ02_MSG_OBJ J02 
                    ON I50.SPGJ02_MSG_K = J02.SPGJ02_MSG_K  
                  LEFT JOIN CSPGJ03_MSG_TRANSLN J03 
                    ON J02.SPGJ02_MSG_K = J03.SPGJ02_MSG_K  
                  where I50.[SPGA04_RATING_ELEMENT_D] = 1  
                    and I01.[SPGI01_EXCEPTIONED_F] = ''N'' 
                    and I01.[SPGI01_DISPUTED_F] != ''Y''  
                    AND J03.[SPGJ03_LOCALE_C] =  ''en_US''  
                    and I01.[SPGA02_BUSINESS_TYPE_C] = ''PROD'' 
                    and I01.[SPGA03_REGION_C] = ''EU''  
                    and I01.[SPGI01_SUB_BUSINESS_TYPE_C] = ''PRD''
                    and I01.[SPGI01_CREATE_S] between '+ convert(varchar(10), @StartDate, 120)+' AND '+ convert(varchar(10), @EndDate, 120)+'
              ) x
              pivot 
              (
                  count(WeekEnd)
                  for weekno in (' + @cols + ')
              ) p 
             ) x1
             GROUP BY InstanceType WITH ROLLUP '

execute(@query)

Nota:esto no se ha probado ya que no tengo datos de muestra, etc.