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select [Month], 
       sum(case when PostTypeId = 1 and 0 < 1 then 1 else 0 end) All_Questions,
       sum(case when PostTypeId = 1 and AnswerCount > 0 then 1 else 0 end) Questions_with_Answers,
       sum(case when PostTypeId = 2 and 0 < 1 then Score else 0 end) Answers
from
(
  select CAST(
      cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + cast(DATEPART(MM, CreationDate) as varchar) + '-01'
    as datetime) [Month], 
    AnswerCount, PostTypeId, Score
     
  from Posts p
  where ClosedDate is NULL
) as X
group by [Month]
order by [Month] asc

fork query

edited jul 9 18 anonymous

created jan 16 12 sam.saffron