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select distinct
  PostId as [Post Link],
  UserId as [User Link]
from PostHistory
where PostHistoryTypeId=19
and PostId not in 
 (select p.PostId 
  from PostHistory p
  join PostHistory up on up.PostId=p.PostId
  where p.PostHistoryTypeId=19
   and up.PostHistoryTypeId=20
  group by p.PostId
  having max(up.CreationDate) > max(p.CreationDate))

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