Unmerged answered self-duplicates (list of stub Qs)


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Find duplicate questions where OP from the stub post (source) is the same OP as from the destination post (master/target) and both stub/source and master/target questions have answers (hence, they are candidates to be merged).

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WITH stub_list AS
        p.OwnerUserId, -- OP from source (stub)
        pl.RelatedPostId -- Post Destination (master)
 FROM Posts p
 JOIN PostLinks pl ON pl.PostId = p.Id
 WHERE p.PostTypeId = 1 -- questions.
       AND EXISTS 
        SELECT *
        FROM PostHistory ph
        WHERE ph.PostId = p.Id
        AND ph.PostHistoryTypeId IN (10) -- Post Closed (duplicate)     
      AND pl.LinkTypeId = 3 -- duplicate.
      AND p.AnswerCount > 0
SELECT s.Id AS [Post Link],
FROM stub_list s
JOIN Posts p ON p.Id = s.RelatedPostId
WHERE s.OwnerUserid = p.OwnerUserId -- OP from source (stub) = OP from destination (master)
      AND p.AnswerCount > 0 -- target question has answers, so as the stub.
ORDER BY s.Score ASC; -- low qualities first

--Linked posts: 

--GIS - https://gis.meta.stackexchange.com/questions/4988/deleting-merged-questions-asked-by-the-same-op/5003#5003
--MSE - https://meta.stackexchange.com/questions/322241/how-to-find-duplicates-that-could-be-deleted/322243#322243.

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