> DBs can return inserted data to you; Postgres and SQLite can return the entire row, and MySQL can return the last generated auto-increment ID. Assuming you c

> DBs can return inserted data to you; Postgres and SQLite can return the entire row, and MySQL can return the last generated auto-increment ID. Assuming you can+want to talk to a database right then. The useful part of UUIDs is that they can be generated anywhere, locally, remotely, same DB, separate DB, online, offline, and never change.