Most frequent tag creators

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---the query looks at the first revisiont with the given tag
---mostly that could correspond to tag creator
---in some cases the post where the tag was created might have been deleted
; with tagshistory_cte AS
(
SELECT
  Id AS phid,
  replace(value,'>','') TagName
FROM
  PostHistory
  CROSS APPLY STRING_SPLIT(Text,'<')
Where PostHistoryTypeId in (3,6,9)
and len(value) > 0
), tagsfirst_cte AS (
SELECT
  tagname,
  MIN(phid) AS firstid
FROM tagshistory_cte
GROUP BY tagname
)

SELECT
  COUNT(t.tagname) AS Count,
  ph.UserId AS [User Link],
  ph.UserDisplayName
FROM tagsfirst_cte t INNER JOIN PostHistory ph ON ph.id=t.firstid
GROUP BY ph.UserId, ph.UserDisplayName
ORDER BY COUNT(t.tagname) DESC

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