Chapter 1. Introduction to PostgreSQL and SQL
PostgreSQL is an open source, client/server, relational database. PostgreSQL offers a unique mix of features that compare well to the major commercial databases such as Sybase, Oracle, and DB2. One of the major advantages to PostgreSQL is that it is open source—you can see the source code for PostgreSQL. PostgreSQL is not owned by any single company. It is developed, maintained, broken, and fixed by a group of volunteer developers around the world. You don't have to buy PostgreSQL—it's free. You won't have to pay any maintenance fees (although you can certainly find commercial sources for technical support).
PostgreSQL offers all the usual features of a relational database plus quite a few unique features. ...
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