Listing tag creators

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MathOverflow

Q&A for professional mathematicians

---the problem seems to be that tagshistory_cte runs over 50000 rows limit
---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
  t.tagname,
  ph.CreationDate,
  ph.UserId AS [User Link],
  ph.UserDisplayName
FROM tagsfirst_cte t INNER JOIN PostHistory ph ON ph.id=t.firstid
ORDER BY ph.id DESC

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