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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE > What is PostgreSQL?</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Preface" HREF="preface.html"><LINK REL="PREVIOUS" TITLE="Preface" HREF="preface.html"><LINK REL="NEXT" TITLE="A Brief History of PostgreSQL" HREF="history.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Preface" HREF="preface.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="preface.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Preface</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="A Brief History of PostgreSQL" HREF="history.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="INTRO-WHATIS" >What is <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN >?</A ></H1 ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > is an object-relational database management system (<ACRONYM CLASS="ACRONYM" >ORDBMS</ACRONYM >) based on <A HREF="http://db.cs.berkeley.edu/postgres.html" TARGET="_top" > <SPAN CLASS="PRODUCTNAME" >POSTGRES, Version 4.2</SPAN ></A >, developed at the University of California at Berkeley Computer Science Department. POSTGRES pioneered many concepts that only became available in some commercial database systems much later. </P ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > is an open-source descendant of this original Berkeley code. It supports a large part of the SQL standard and offers many modern features: <P ></P ></P><UL COMPACT="COMPACT" ><LI ><SPAN >complex queries</SPAN ></LI ><LI ><SPAN >foreign keys</SPAN ></LI ><LI ><SPAN >triggers</SPAN ></LI ><LI ><SPAN >views</SPAN ></LI ><LI ><SPAN >transactional integrity</SPAN ></LI ><LI ><SPAN >multiversion concurrency control</SPAN ></LI ></UL ><P> Also, <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > can be extended by the user in many ways, for example by adding new <P ></P ></P><UL COMPACT="COMPACT" ><LI ><SPAN >data types</SPAN ></LI ><LI ><SPAN >functions</SPAN ></LI ><LI ><SPAN >operators</SPAN ></LI ><LI ><SPAN >aggregate functions</SPAN ></LI ><LI ><SPAN >index methods</SPAN ></LI ><LI ><SPAN >procedural languages</SPAN ></LI ></UL ><P> </P ><P > And because of the liberal license, <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > can be used, modified, and distributed by anyone free of charge for any purpose, be it private, commercial, or academic. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="preface.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="history.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Preface</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="preface.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >A Brief History of <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >