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select YR_WK, count(*) as NumActiveExperts
from
(
  select
      (datepart(yy, p.creationdate) + datepart(wk, p.creationdate) / 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) / 52.0)
    , u.id
) AnsPerUPerWk
where NumAnswers > 1
group by YR_WK
order by YR_WK asc

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edited jul 29 15

created jul 29 15 Isaac Moses