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SELECT
  DATEPART(dayofyear,CreationDate),
  CAST(SUM(CASE when AnswerCount > 0 then 1 else 0 END) as float)/COUNT(Posts.Id) as Ratio
FROM Posts
WHERE PostTypeId=1
GROUP BY DATEPART(dayofyear,CreationDate)
ORDER BY DATEPART(dayofyear,CreationDate) ASC

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created oct 7 16 jon.doe7173