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SELECT TOP(##num?100##)
  u.Id AS [User Link],
  COUNT(DISTINCT pt.TagId) AS [# of tags]
FROM Users u INNER JOIN Posts a ON a.OwnerUserId=u.Id
  INNER JOIN Posts q ON a.ParentId=q.Id
  INNER JOIN PostTags pt ON pt.PostId=q.Id
GROUP BY u.Id  
ORDER BY COUNT(DISTINCT pt.TagId) DESC

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edited jul 15

created jul 15 Martin20528