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SELECT date1 as creationDate, AVG(diff1) as avgDaysToClose
FROM (

  SELECT 
    DATEDIFF(day, d.CreationDate, d.ClosedDate) as [diff1],
    FORMAT (d.CreationDate, 'yy-MM') as [date1],
    FORMAT (d.ClosedDate, 'yy-MM') as [date2],
    (d.Id) as id
  FROM Posts d 
    LEFT JOIN PostHistory ph ON ph.PostId = d.Id
    LEFT JOIN PostLinks pl ON pl.PostId = d.Id
    LEFT JOIN Posts o ON o.Id = pl.RelatedPostId  -- o=original
  WHERE
    d.PostTypeId = 1  -- 1=Question
    AND pl.LinkTypeId = 3  -- 3=duplicate
    AND ph.PostHistoryTypeId = 10  -- 10=Post Closed
    
  ) as t1
group by date1
order by date1

fork query

edited jul 12 19

created jul 9 19 Moradnejad