Is there a way to access the rowid in postgres, like in oracle? In don't find anything in the doc.

Sounds like you're looking for OIDs (object IDs).

Everything in PG has them: rows, tables, etc.

You really should check the docs to learn more about them though.

OID and ROWID both provide a unique identifier for a row and that is where the similary end between these two. ROWID encode the location of row (file, block , row) where as OID is just 32 bit number.

ok, thanks for all.