Posts that are the target of the most duplicate closures

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-- 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.

-- When was the new duplicate-closure system (with real banners rather than ad
-- hoc markdown) implemented? <http://meta.stackexchange.com/q/166707/224428>
DECLARE @lti3_start_date AS datetime = (
  SELECT MIN(CreationDate) FROM StackOverflow..PostLinks WHERE LinkTypeId = 3)

SELECT
  COUNT(PostId) AS [DuplicateCount],
  RelatedPostId AS [Post Link]
FROM ( -- grab both real duplicate banners and pseudo duplicate banners
  SELECT
    PostId,
    RelatedPostId
  FROM
    PostLinks AS pl
  WHERE
    pl.LinkTypeId = 3 -- duplicate
  
  UNION
  
  SELECT
    PostId,
    RelatedPostId
  FROM
    PostLinks AS pl
  WHERE
    pl.LinkTypeId = 1
    AND pl.CreationDate < @lti3_start_date -- safety check
    AND EXISTS (
      SELECT 1 
      FROM Posts AS p 
      WHERE 
        p.Id = pl.PostId 
        AND p.Body LIKE '%<strong>Possible Duplicate:</strong>%'
        AND p.Body LIKE '%/questions/' + CAST(pl.RelatedPostId AS nvarchar) + '/%'
    )
  ) AS subq
WHERE
  RelatedPostId IN (SELECT p.Id FROM Posts AS p)
GROUP BY
  RelatedPostId
ORDER BY 
  [DuplicateCount] DESC

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