Questions and Answers per week

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Plot the site activity by voting, questions, answers and comments, aggregated per week.

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Q&A for professional and enthusiast programmers

with Activity as (
    select DATEADD(DAY, 7 - DATEPART(WEEKDAY, v.CreationDate), v.CreationDate) as YearMon,
       case when p.PostTypeId = 1 then 'Q' else 'A' end + vt.Name as Series,
       count(*) as Action
    from Posts p,
         Votes v,
         VoteTypes vt
    where p.Id = v.PostId
      and v.VoteTypeId = vt.Id
    group -- fix
       by DATEADD(DAY, 7 - DATEPART(WEEKDAY, v.CreationDate), v.CreationDate),
          case when p.PostTypeId = 1 then 'Q' else 'A' end + vt.Name
  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 -- fix
       by DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,p.CreationDate)), Convert(DATE, p.CreationDate)),
          pt.Name
)
select *
from Activity
pivot (
    sum(Action)
    for Series in ([Question],[Answer],[QUpMod],[QDownMod],[QFavorite],[AUpMod],[ADownMod],[AAcceptedByOriginator]))
    as Pivoted
where YearMon >= DATEADD(WEEK, -60, CURRENT_TIMESTAMP) -- previous 60 weeks.
  and YearMon < CURRENT_TIMESTAMP -- ignore most recent week.
order by YearMon

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