Average time between post creation and first vote

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SELECT top 30
CONVERT(DATETIME, CONCAT(YEAR(p.CreationDate), '-', MONTH(p.CreationDate), '-01'), 20) AS Mes,
avg(datediff(day,p.CreationDate,v.CreationDate))

FROM Posts as p JOIN (Select TOP 1 CreationDate,PostId FROM Votes ORDER BY CreationDate DESC) v ON v.PostId=p.Id
GROUP BY YEAR(p.CreationDate), MONTH(p.CreationDate)
ORDER BY YEAR(p.CreationDate), MONTH(p.CreationDate)

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