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;  with revisions_cte as
(
SELECT
DISTINCT p.Id AS pid, ph1.Id AS phId
FROM PostHistory ph1 INNER JOIN Posts p ON ph1.PostId=p.Id
WHERE ph1.PostHistoryTypeId in (2,5,8)
  and ph1.Text Like '%##word?research.att.com##%'
  and NOT(p.Body Like '%##word##%')
), firstrev_cte AS
(SELECT
pid, MIN(ph2.Id) as MinId
  FROM revisions_cte INNER JOIN PostHistory ph2 ON ph2.PostId=pid
  WHERE (ph2.Id>phId)
   AND ph2.PostHistoryTypeId in (2,5,8)
   AND NOT(ph2.Text Like '%##word##%')
GROUP BY pid
)
--- 2 = Initial Body - initial post raw body text
--- 5 = Edit Body - modified post body (raw markdown)
--- 8 = Rollback Body - reverted body (raw markdown)

SELECT CAST(CreationDate AS DATE), Count(PostId) AS [Count]
FROM PostHistory INNER JOIN firstrev_cte ON PostHistory.Id=MinId
GROUP BY CAST(CreationDate AS DATE)
ORDER BY CAST(CreationDate AS DATE) DESC

fork query

created oct 20 Martin20528