Plot the site activity by voting, questions, answers and comments, aggregated per week.
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with Voting as ( select DATEPART(Year, v.CreationDate) * 100 + DatePart(Month, v.CreationDate) as YearMon, case when p.PostTypeId = 1 then 'Q' else 'A' end + vt.Name as Series, 1 as Vote from Posts p, Votes v, VoteTypes vt where p.Id = v.PostId and v.VoteTypeId = vt.Id ) select * -- YearMon, Series, Count(Vote) as Votes from Voting pivot ( sum(Vote) for Series in ([QUpMod],[QDownMod],[QFavorite],[AUpMod],[ADownMod],[AAcceptedByOriginator])) as Pivoted where YearMon >= 201101 order by YearMon --group by YearMon, Series