sql - connect_by_root equivalent in postgres -


how can covert connect_by_root query of oracle in postgres. ex: oracle query.

select fg_id, connect_by_root fg_id fg_classifier_id fg start parent_fg_id null connect prior fg_id = parent_fg_id

you use recursive common table expression "carries" root through recursion levels:

with recursive fg_tree (   select fg_id,           fg_id fg_clasifier_id -- <<< "root"    fg   parent_fg_id null -- <<< "start with" part   union   select c.fg_id,           p.fg_clasifier_id   fg c      join fg_tree p on p.fg_id = c.parent_fg_id -- <<< "connect by" part )  select * fg_tree;

more details on recursive common table expressions in manual: http://www.postgresql.org/docs/current/static/queries-with.html


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