SKIP LOCKED isn't quite enough to get a real MQ product. Oracle has a full blown MQ product inside it transactional with other data.
In particular you need the ability to wait for messages to appear in a queue without polling, and for a proper MQ you need things like message priority, exception queues, multi-queue listening, good scalability etc.
Comments
Postgres is not the only database that does queues.
Any database that supports SKIP LOCKED is fine including MySQL, MSSQL, Oracle etc.
Even SQLite makes a fine queue not via skip locked but because writes are atomic.
SKIP LOCKED isn't quite enough to get a real MQ product. Oracle has a full blown MQ product inside it transactional with other data.
In particular you need the ability to wait for messages to appear in a queue without polling, and for a proper MQ you need things like message priority, exception queues, multi-queue listening, good scalability etc.