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select dateadd(month, datediff(month, 0, q.CreationDate), 0) m, TagName, count(*)
from PostTags pt
join Posts q on q.Id=pt.PostId
join Tags t on t.Id=pt.TagId
where TagName in ('.net', 'java')
and q.CreationDate < dateadd(month, datediff(month, 0, getdate()), 0)
group by dateadd(month, datediff(month, 0, q.CreationDate), 0), TagName
order by dateadd(month, datediff(month, 0, q.CreationDate), 0)

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edited may 8 17

created jun 14 14 anonymous