Number of active experts per week

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-- Time series of the number of active experts per week
-- Where "active expert" is someone who has posted more than one upvoted answer.
-- Per Deer Hunter's definition in http://meta.stackexchange.com/a/261608/
--
-- X-axis is in years, so the point at 2015.0 is the first week of 2015.


select YR_WK, count(*) as NumActiveExperts
from
(
  select
      (datepart(yy, p.creationdate) + (datepart(wk, p.creationdate)-1) / 52.0) as YR_WK
    , u.id as UID
    , count (*) as NumAnswers
  from users u
  inner join posts p on
        p.owneruserid = u.id
    and p.posttypeid = 2
    and p.score > 0
  group by 
     (datepart(yy, p.creationdate) + (datepart(wk, p.creationdate)-1) / 52.0)
    , u.id
) AnsPerUPerWk
where NumAnswers > 1
group by YR_WK
order by YR_WK asc

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