This isn't just a PG thing. The wiki article isn't great, but the references have links to sqlite, mssql, oracle, ibm, etc. https://en.wikipedia.org/wiki/Hier

This isn't just a PG thing. The wiki article isn't great, but the references have links to sqlite, mssql, oracle, ibm, etc. https://en.wikipedia.org/wiki/Hierarchical_and_recursive_queries_in_SQL https://en.wikipedia.org/wiki/Hierarchical_and_recursive_que...