Plot the site activity by voting, questions, answers and comments, aggregated per week.
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with Activity as ( select DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,u.CreationDate)), CONVERT(DATE,u.CreationDate)) as YearMon, 'NewUser' as Series, count(*) as Action from Users u group by DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,u.CreationDate)), CONVERT(DATE,u.CreationDate)) UNION select DATEADD(DAY, 7 - DATEPART(WEEKDAY, v.CreationDate), v.CreationDate) as YearMon, case when v.VoteTypeId = 1 then 'Accept' when p.PostTypeId = 1 then 'QuestionVote' else 'AnswerVote' end as Series, count(*) as Action from Posts p, Votes v where p.Id = v.PostId and v.VoteTypeId in (1, 2, 3) group by DATEADD(DAY, 7 - DATEPART(WEEKDAY, v.CreationDate), v.CreationDate), case when v.VoteTypeId = 1 then 'Accept' when p.PostTypeId = 1 then 'QuestionVote' else 'AnswerVote' end UNION select DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,p.CreationDate)), Convert(DATE, p.CreationDate)) as YearMon, pt.Name as Series, count(*) as Action from Posts p, PostTypes pt where p.PostTypeId in (1, 2) and p.PostTypeId = pt.Id Group by DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,p.CreationDate)), Convert(DATE, p.CreationDate)), pt.Name UNION SELECT DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,c.CreationDate)), Convert(DATE, c.CreationDate)) as YearMon, 'Comment' as Series, count(*) as Action from Comments c Group by DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,c.CreationDate)), Convert(DATE, c.CreationDate)) ) select * from Activity pivot ( sum(Action) for Series in ([NewUser],[Question],[Answer],[Comment],[QuestionVote],[AnswerVote],[Accept])) as Pivoted where YearMon >= DATEADD(WEEK, -60, CURRENT_TIMESTAMP) -- previous 60 weeks. and YearMon < CURRENT_TIMESTAMP -- ignore most recent week. order by YearMon