PostgreSQL is one of the most versatile, powerful and reliable object-relational database systems available. The enterprise-class open source database is in use by some of the largest companies in the world, handling exceptionally large workloads. But you knew all of that already, so let's talk about a few features in PostgreSQL you probably didn't know about already. The fact is that PostgreSQL is a sophisticated creature. You have to dive beneath the surface to really understand just what PostgreSQL is actually capable of.