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).
Q&A for people interested in the history and origins of science and mathematics
-- step 1: find IDs of dupes with deleted targets
CREATE TABLE #DeletedDupes (
PostId INT NOT NULL,
RelatedPostId INT NOT NULL
INSERT INTO #DeletedDupes
PostLinks as BrokenLink
LEFT JOIN Posts as TargetPost
ON TargetPost.Id = BrokenLink.RelatedPostId
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
OtherLink.LinkTypeId = 3
AND OtherLink.PostId = BrokenLink.PostId
-- step 2: filter out dupes of migrated posts (TODO!)
-- step 3: format results nicely
SourcePost.Id as [Post Link],
SourcePost.ViewCount as Views,
SourcePost.AnswerCount as Answers,
MAX(Answer.Score) as AScore,
(CASE WHEN SourcePost.AcceptedAnswerId IS NULL THEN '' ELSE 'Accepted' END) as Accepted,
SourcePost.ClosedDate as Closed,
WHEN MAX(LockEvent.Id) IS NOT NULL AND (SELECT PostHistoryTypeId FROM PostHistory WHERE Id = MAX(LockEvent.Id)) = 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]
#DeletedDupes as BrokenLink
JOIN Posts as SourcePost
ON SourcePost.Id = BrokenLink.PostId
LEFT JOIN Posts as Answer
ON Answer.PostTypeId = 2
AND Answer.ParentId = SourcePost.Id
LEFT JOIN PostHistory as LockEvent
ON LockEvent.PostHistoryTypeId IN (14, 15)
AND LockEvent.PostId = SourcePost.Id