Questions and Answers per Month

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select [Month], 
       sum(case when PostTypeId = 1 and closeddate is null then 1 else 0 end) Questions,
       sum(case when PostTypeId = 2 or (PostTypeId = 1 and not closeddate is null) then 1 else 0 end) AnswersAndClosed,
       sum(case when PostTypeId = 2 then 1 else 0 end) Answers
from
(
  select CAST(
      cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + cast(DATEPART(MM, CreationDate) as varchar) + '-01'
    as datetime) [Month], 
    PostTypeId, ClosedDate
     
  from Posts p
) as X
group by [Month]
order by [Month] asc

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