Number of active experts per week in a TAG (SO), parameterized

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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.

DECLARE @tag nvarchar(25)

SET @tag = '##tagName##'

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
  inner join posts q 
  on
    p.ParentId = q.id 
    and q.posttypeid = 1
  inner join posttags pt
  on pt.postid=q.id
  inner join tags t
  on 
   t.id = pt.tagid 
   and t.tagname=@tag
  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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