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How many questions per month does each area tag get

Q&A for theoretical computer scientists and researchers in related fields

select *, count(*) from
(
  select CAST(
      cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + cast(DATEPART(MM, CreationDate) as varchar) + '-01'
    as datetime) [Month], 
    t.TagName
  from Posts p 
  join PostTags pt on pt.PostId = p.Id
  join Tags t on t.Id = pt.TagId
  where TagId in 
  (
    select top ##num## Id from Tags
    where TagName like '%.%' or 
          TagName='computability' or 
          TagName='Quantum computation'
    order by Count desc
  ) and
  (DATEPART(YYYY, CreationDate) >= ##YYYY## or
  (DATEPART(YYYY, CreationDate) = ##YYYY## and DATEPART(MM, CreationDate) >= ##MM##))
) as X
group by TagName, [Month]
order by [Month] asc, TagName asc

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edited apr 4 13 Kaveh

created jan 16 12 sam.saffron