Duplicates of deleted questions

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This query lists questions that have been closed as duplicates of another question that has since been deleted. Such questions should be either deleted or, if they have good answers or are otherwise of decent quality, reopened. Note that non-locked questions with no answers and a negative score will be automatically deleted by the RemoveDeadQuestions script after 30 days, as indicated by the "Roombable?" column. By default, the results will be sorted with the most recently closed questions first. You can click the column headings to change the sort order. For example, questions with a high answer score may be good candidates for reopening (or for a historical lock), while questions with a high score but no answers may simply need a new dupe target (see http://meta.stackexchange.com/q/291824). Note that this list also includes some duplicates of migrated questions. Those are actually harmless, and there's generally no need to do anything about them.

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-- step 1: find dupes with deleted targets
CREATE TABLE #DeletedDupes (
  PostId INT NOT NULL,
  TargetId INT NULL,
  AnswerScore INT NULL,
  LockEventId INT NULL
)

INSERT INTO #DeletedDupes
SELECT
  BrokenLink.PostId as PostId,
  MAX(BrokenLink.RelatedPostId) as TargetId,
  MAX(Answer.Score) as AnswerScore,
  MAX(LockEvent.Id) as LockEventId
FROM
  PostLinks as BrokenLink
  LEFT JOIN Posts as TargetPost
    ON TargetPost.Id = BrokenLink.RelatedPostId
  LEFT JOIN Posts as Answer
    ON Answer.PostTypeId = 2 AND Answer.ParentId = BrokenLink.PostId
  LEFT JOIN PostHistory as LockEvent
    ON LockEvent.PostHistoryTypeId IN (14, 15) AND LockEvent.PostId = BrokenLink.PostId
WHERE
  BrokenLink.LinkTypeId = 3
  AND TargetPost.Id IS NULL
  AND NOT EXISTS ( 
    SELECT 1 FROM
      PostLinks as OtherLink
      JOIN Posts as OtherTarget
        ON OtherTarget.Id = OtherLink.RelatedPostId
    WHERE
      OtherLink.LinkTypeId = 3 AND OtherLink.PostId = BrokenLink.PostId
  )
GROUP BY
  BrokenLink.PostId
  
-- step 2: format results nicely
SELECT
  BrokenLink.PostId as [Post Link],
  SourcePost.ViewCount as Views,
  SourcePost.Score,
  SourcePost.AnswerCount as Answers,
  BrokenLink.AnswerScore as AScore,
  (CASE WHEN SourcePost.AcceptedAnswerId IS NULL THEN '' ELSE 'Accepted' END) as Accepted,
  SourcePost.ClosedDate as Closed,
  TargetPost.DeletionDate as Deleted,
  (CASE
    WHEN LockEventId IS NOT NULL AND (SELECT PostHistoryTypeId FROM PostHistory WHERE Id = LockEventId) = 14 THEN 'No (Post Locked)'
    WHEN SourcePost.AnswerCount = 1 THEN 'No (1 answer)'
    WHEN SourcePost.AnswerCount > 1 THEN 'No (' + Cast(SourcePost.AnswerCount as VARCHAR) + ' answers)'
    WHEN SourcePost.Score = 0 THEN 'If downvoted'
    WHEN SourcePost.Score > 0 THEN 'If downvoted x' + Cast(SourcePost.Score+1 as VARCHAR)
    ELSE 'Yes, on ' + Convert(VARCHAR(10), DateAdd(Day, 30, SourcePost.CreationDate), 126)
  END) as [Roombable?],
  SourcePost.Tags as [Tags]
FROM
  #DeletedDupes as BrokenLink
  JOIN Posts as SourcePost ON SourcePost.Id = BrokenLink.PostId
  LEFT JOIN PostsWithDeleted as TargetPost ON TargetPost.Id = BrokenLink.TargetId
ORDER BY
  TargetPost.DeletionDate DESC

Enter Parameters

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