http://meta.stackexchange.com/questions/273645/trends-on-stack-overflow
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select datediff(w, p.creationdate, getdate()) , count(*) [Python] from posts p inner join posttags pt on pt.postid = p.id inner join tags t on t.id = pt.tagid where tagname = 'python' group by datediff(w, p.creationdate, getdate())