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Q&A for Ubuntu users and developers

/* BEST TIME TO ASK QUESTIONS

The best time here is when the delay between a question and an accepted
answer is shortest.

On the graph, look for the value on the x-scale that
corresponds to the minimum value on y-scale.
That's the best time as defined above.

As for Dec 2013, the smallest time-to-answer was for questions asked
on Saturday at 1pm GMT. The asker had to wait only for 78 minutes.
*/


DECLARE @Frequency int = ##Frequency:int?3##
DECLARE @MaxTimeDiff int = ##MaxTimeDiff:int?1440##
DECLARE @All int = ##All:int?1##
DECLARE @UsedId int = ##UserId:int##
DECLARE @MoreStats int = ##MoreStats:int?0##

;WITH tmp AS
(
  SELECT timeDiff = DATEDIFF(minute, q.CreationDate, a.CreationDate),
         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
    LEFT OUTER JOIN Posts a ON q.AcceptedAnswerId = a.Id
  WHERE q.AcceptedAnswerId > 0
    AND q.OwnerUserId = CASE WHEN @All = 1 THEN q.OwnerUserId ELSE @UsedId END
  )
  SELECT Period,
    AVG(timeDiff) AS [Time to answer]
--    ,CASE WHEN @MoreStats = 1 THEN STDEV(timeDiff) AS [Time to answer (Standard deviation)] END
FROM tmp
WHERE ABS(timeDiff) < @MaxTimeDiff
GROUP BY Period
ORDER BY Period

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