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SELECT DATEFROMPARTS(Year, Month, 1), Votes--, Answers, 100 * ROUND(Votes * 1.0 / Answers, 2) as Perf
  FROM (
    SELECT *,
      (SELECT COUNT(*) FROM Posts as AllPosts
        WHERE 
        AllPosts.OwnerUserId = ##UserId## And
        AllPosts.CreationDate <= DATEFROMPARTS(Year, Month, 1)
      ) AS Answers
      FROM (
        SELECT DATEPART(YYYY, Votes.CreationDate) AS Year, 
          DATEPART(MM, Votes.CreationDate) AS Month, 
          count(*) AS Votes
          FROM Votes
            INNER JOIN Posts on Votes.PostId = Posts.Id
          WHERE Posts.OwnerUserId = ##UserId##
            AND DATEDIFF(DD, Posts.CreationDate, Votes.CreationDate) > 30
          GROUP BY DATEPART(YYYY, Votes.CreationDate), DATEPART(MM, Votes.CreationDate)
      ) as Raw
  ) as Raw
WHERE YEAR > 2017
ORDER BY Year, Month

fork query

edited may 8

created dec 30 18 Titian.Dragomir