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Q&A for professional robotic engineers, hobbyists, researchers and students

select *, count(*) from
(
  select CAST(
      cast(DATEPART(YYYY, CreationDate) as varchar) + '-' + 
      cast(DATEPART(MM, CreationDate) as varchar) + '-01'
    as date) Month, 
    t.TagName
  from Posts p 
  join PostTags pt on pt.PostId = p.Id
  join Tags t on t.Id = pt.TagId
  where t.TagName in ('java', 'c#',
  'php', 'ruby')
) as X
where month between cast('2010-01-01' as date) and cast('2012-04-20' as date)
group by TagName, Month
order by Month asc, count(*) desc

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created apr 27 12 anonymous