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Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition

DECLARE @All int = ##All:int?1##
DECLARE @Frequency int = ##Frequency:int?3##
DECLARE @UsedId int = ##UserId:int##
DECLARE @YearsBack int = ##YearsBack:int?1##

;WITH tmp AS
(
  SELECT q.ViewCount,
         Period = CASE @Frequency
           WHEN 1 THEN DATEPART("hour", q.CreationDate)
           WHEN 2 THEN DATEPART("weekday", q.CreationDate)
           WHEN 3 THEN ROUND((CAST(DATEPART("weekday", q.CreationDate) AS numeric) +
             CAST(DATEPART("hour", q.CreationDate) AS numeric) / 24), 2) END
  FROM Posts q
  WHERE q.OwnerUserId = CASE WHEN @All = 1 THEN q.OwnerUserId ELSE @UsedId END
    AND q.CreationDate > DATEADD("year", -@YearsBack, CURRENT_TIMESTAMP)
    AND q.PostTypeId = 1
  )
  SELECT Period, CAST(SUM(ViewCount) AS FLOAT)/CAST(COUNT(*) AS FLOAT) AS [Views per question]
FROM tmp
GROUP BY Period
ORDER BY Period

view current version

edited dec 24 13

created dec 21 13 Anton.