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select TagName,
  (
    select count(TagName)
    from Tags
    join PostTags on PostTags.TagId = Tags.Id
    join Posts on Posts.Id = PostTags.PostId
    where Posts.CreationDate > DATEADD(year, -1, GetDate())
    and TagName = allTheTags.TagName
    group by Tags.TagName
  ) as theYear
from Tags allTheTags
where allTheTags.TagName in ('C++','Java')

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edited jul 2 12

created jul 2 12 mnr