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Q&A for those who study, teach, research and apply economics and econometrics

SELECT
  PostLinks.PostId as [Post Link]
FROM
  PostLinks
WHERE
  PostLinks.LinkTypeId = 3 AND
  (SELECT
     Posts.Id
   FROM
     Posts
   WHERE
     Posts.Id = PostLinks.PostId
     ) IS NOT NULL AND
  (SELECT
     Posts.Id
   FROM
     Posts
   WHERE
     Posts.Id = PostLinks.RelatedPostId
     ) IS NULL
GROUP BY PostLinks.PostId
ORDER BY PostLinks.PostId

fork query

edited feb 19 14

created feb 19 14 animuson