Posts that are the target of the most duplicate closures

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DECLARE @lti3_start_date AS datetime = (
  SELECT MIN(CreationDate) FROM StackOverflow..PostLinks WHERE LinkTypeId = 3)
  

-- Some deleted posts still live in PostLinks.RelatedPostId because they are the
-- closure target of a non-deleted post. I've excluded those from the query below.

SELECT
  PostId AS [Post Link]
FROM (
  SELECT
    *
  FROM
    PostLinks AS pl
  WHERE
    pl.LinkTypeId = 3 -- duplicate
  
  UNION
  
  SELECT
    *
  FROM
    PostLinks AS pl
  WHERE
    pl.LinkTypeId = 1
    AND pl.CreationDate < @lti3_start_date
    AND EXISTS (
      SELECT 1 
      FROM Posts AS p 
      WHERE 
        p.Id = pl.PostId 
        --AND p.Body LIKE '%Possible Duplicate%End of automatically inserted text%'
        --AND p.Body LIKE '%/questions/' + CAST(pl.RelatedPostId AS nvarchar) + '/%'
    )
  ) AS subq
WHERE
  RelatedPostId IN (SELECT p.Id FROM Posts AS p)
  AND LinkTypeId = 1
ORDER BY CreationDate DESC

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