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SELECT
CONVERT(DATETIME, CONCAT(YEAR(Posts.CreationDate), '-', MONTH(Posts.CreationDate), '-01'), 20) AS Mes,
avg(datediff(day,Posts.CreationDate,v.FirstVoteCreationDate))
FROM (SELECT MAX(CreationDate) as FirstVoteCreationDate, PostId FROM Votes GROUP BY PostId) v JOIN Posts on Posts.Id=v.PostId
GROUP BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate)
ORDER BY YEAR(Posts.CreationDate), MONTH(Posts.CreationDate)

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edited jul 24 15

created jul 24 15 Renato.Sinohara