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

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Psychology and Neuroscience

Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry

select
      t.tagname, count (distinct p.owneruserid) as Users
  from users u, posts p, posttags pt, tags t
  where
        p.owneruserid = u.id
    and p.posttypeid = 2
    and p.score > 0
    and pt.postid=p.ParentId
    and t.id = pt.tagid 
    and (t.tagname='c' OR t.tagname='java' OR t.tagname='mysql' OR t.tagname='c#')
  group by t.tagname

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