2 1. What Is PostgreSQL? #
4 PostgreSQL is an object-relational database management system (ORDBMS)
5 based on POSTGRES, Version 4.2, developed at the University of
6 California at Berkeley Computer Science Department. POSTGRES pioneered
7 many concepts that only became available in some commercial database
10 PostgreSQL is an open-source descendant of this original Berkeley code.
11 It supports a large part of the SQL standard and offers many modern
17 * transactional integrity
18 * multiversion concurrency control
20 Also, PostgreSQL can be extended by the user in many ways, for example
27 * procedural languages
29 And because of the liberal license, PostgreSQL can be used, modified,
30 and distributed by anyone free of charge for any purpose, be it
31 private, commercial, or academic.