https://stackoverflow.com/questions/linked/13047806?q=duplicate%3Ayes shows the questions linked to/from question with
13047806 id. Note: the query
duplicate:yes in the link is ignored: the search box shows 'duplicate:yes' but the result list has questions that are not duplicates. Is there a way to enable
It is not possible with the search engine on the site but you can use SEDE if you're OK if the data can be up to an week old.
This query shows the post that is linked with posts that are duplicate:
select distinct pl.relatedpostid as [Post Link] , pl.postid as [Post Link] from postLinks pl inner join postlinks dl on dl.postid = pl.postid and dl.linktypeid =3 -- duplicate where 1=1 and pl.relatedpostid = 13047806
The PostLinks table holds rows for LinkTypes 1 (linked) and 3 (duplicate).
relatedpostid holds the target, while the column
postid holds the source. By joining the postlinks table again on postid where linktype=3 you get your desired result.