A question can be a duplicate of more than one question. Moderators and users with gold tag badges can add questions to the list of questions that a given question is a duplicate of. I was recently closing a question as a duplicate and I saw a lot of similar questions. This led me to wonder: Is there any limit to how many questions I can add to the list? Can I just keep on adding more questions forever, or will the system stop me at some point?
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This seems to imply 3 but it's not clearly and boldly written, 3 is the most I've seen. – Rob Jan 5 '20 at 22:32
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@Rob There was one with four targets that got deleted today. – Sonic the Curiouser Hedgehog Jan 5 '20 at 22:56
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@SonictheAnonymousHedgehog Can you find one with more, give us a FAQ link, or edit the Sandbox question to see how many you can stuff in there. – Rob Jan 5 '20 at 22:59
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1@Rob Don't have a gold badge. 10k+ users can see an example here, and I've pinged someone who probably knows more about it. – Sonic the Curiouser Hedgehog Jan 5 '20 at 23:00
Apparently I should have just tried this before asking. The "add" button is no longer clickable (it is faded out) once there are five questions in the list:
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It's possible that this is just the UI, and you can fudge the request to allow for more targets. – Sonic the Curiouser Hedgehog Jan 5 '20 at 23:17
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@SonictheAnonymousHedgehog there is a server side check as well, the 'save' call returns a 500 error message: i.stack.imgur.com/q5xUF.png – Glorfindel Jan 6 '20 at 7:22
Can't find an official post on this, but the highest amount of dupe-targets I've encountered is five. I wrote a quick SEDE query sorting the posts by number of dupe targets coming from it, and this seems to confirm that "five" assumption.
SELECT
pl.PostId AS [Post Link],
COUNT(LinkTypeId) AS 'Number of dupe-targets'
FROM PostLinks pl
WHERE pl.LinkTypeId=3
GROUP BY pl.PostId
ORDER BY 'Number of dupe-targets' DESC
