text: -- Staged duplicates
  SELECT *
    FROM stg_scopus_affiliations t1
   WHERE EXISTS(SELECT 1
                  FROM stg_scopus_affiliations t2
                 WHERE (t2.scp, t2.affiliation_no) IS NOT DISTINCT FROM (t1.scp, t1.affiliation_no)
                   AND t2.ctid <> t1.ctid)
  -- ORDER BY scp, affiliation_no
  LIMIT 100;
  -- 85062592144 + 1
  