Questions per month, Scala Web Frameworks

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How many questions per month does each tag in the top 10 tags get

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-- How many questions per month for Scala web frameworks?
-- Scala is provided as a reference.
-- playframework-1.x and playframework-2.x don't show up,
-- but there are questions tagged with them. These tags
-- don't show up here, though.

-- Filtering out posts not tagged with "scala" is ugly done,
-- and maybe overly restrictive, but playframework results looks
-- skewed otherwise

select *, count(*) from
(
  select CAST(
      cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + 
      cast(DATEPART(MM, CreationDate) as varchar) + '-01'
    as date) Month, 
    t.TagName
  from (
    select p.Id, p.CreationDate from Posts p
    join PostTags pt on pt.PostId = p.Id
    join Tags t on t.Id = pt.TagId
    where t.TagName = 'scala'
    ) pp
  join PostTags pt on pt.PostId = pp.Id
  join Tags t on t.Id = pt.TagId
  where t.TagName in ( 
  'playframework', 'playframework-1.x',
  'playframework-2.0', 'playframework-2.x', 
  'lift', 'liftweb',
  'scalatra', 'vaadin', 'finagle', 'scalate',
  'pinky', 'xitrum', 'blueeyes', 'circumflex', 'bowler',
  'scala' )
) as X
where month between cast('2010-01-01' as date) and cast('2012-12-31' as date)
group by TagName, Month
order by Month asc, count(*) desc

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