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AdventureWorks
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WITH RECURSIVE links0 AS ( SELECT 1 AS id_from, 2 AS id_to UNION SELECT 2 AS id_from, 3 AS id_to UNION SELECT 4 AS id_from, 3 AS id_to ), links as ( select id_from, id_to from links0 union select id_to, id_from from links0 ), web (id_from,id_to,seen) AS ( SELECT l.id_from, l.id_to, array[least(l.id_from,l.id_to)||'-'||greatest(l.id_from,l.id_to)] FROM links AS l WHERe id_from = 1 UNION ALL SELECT l.id_from, l.id_to, web.seen || (least(l.id_from,l.id_to)||'-'||greatest(l.id_from,l.id_to)) FROM links AS l jOIN web ON l.id_from = web.id_to and not (least(l.id_from,l.id_to)||'-'||greatest(l.id_from,l.id_to) = any(web.seen)) ) SELECT * FROM web
id_from
id_to
seen
1
2
{1-2}
2
3
{1-2,2-3}
3
4
{1-2,2-3,3-4}
SELECT 3