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SELECT TOP 30 CONVERT(DATETIME, CONCAT(YEAR(Posts.CreationDate), '-', MONTH(Posts.CreationDate), '-01'), 20) AS Mes, datediff(day,Posts.CreationDate,v.FirstVoteCD), Posts.CreationDate, v.firstVoteCD FROM (SELECT MIN(CreationDate) as FirstVoteCD, PostId FROM Votes GROUP BY PostId) v JOIN Posts on Posts.Id=v.PostId