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Q&A for professionals and students of engineering

select
  datepart(mm, e.CreationDate) as [month]
  ,datepart(yyyy, e.CreationDate) as [year]
  ,count(1) as reopens
from
   PostHistory c
   join PostHistory e on e.PostId=c.PostId
   join PostHistory r on r.PostId=c.PostId
where
  c.CreationDate < e.CreationDate
  and e.CreationDate < r.CreationDate
  and c.PostHistoryTypeId = 10  -- Close
  and (e.PostHistoryTypeId = 4 or e.PostHistoryTypeId = 5) -- Edit
  and r.PostHistoryTypeId = 11  -- Reopen
group by
  datepart(mm, e.CreationDate)
  ,datepart(yyyy, e.CreationDate)
 order by 
  datepart(yyyy, e.CreationDate)
  ,datepart(mm, e.CreationDate)

fork query

edited sep 6 12

created sep 6 12 anonymous