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>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
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><LI
><SPAN
>complex queries</SPAN
></LI
><LI
><SPAN
>foreign keys</SPAN
></LI
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>triggers</SPAN
></LI
><LI
><SPAN
>views</SPAN
></LI
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><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
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><LI
><SPAN
>data types</SPAN
></LI
><LI
><SPAN
>functions</SPAN
></LI
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>operators</SPAN
></LI
><LI
><SPAN
>aggregate functions</SPAN
></LI
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><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.
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