\section{PostgreSQL}
\textbf{What is PostgreSQL?}

PostgreSQL is a object-relational database management system,
originally developed at the University of California at Berkeley. 
PostgreSQL is based on  Postgres release 4.2. 
The Postgres project, led by Professor Michael Stonebraker, 
was sponsored by the Defense Advanced Research Projects Agency (DARPA), 
the Army Research Office (ARO), the National Science Foundation (NSF), 
and ESL, Inc.

\begin{itemize}
    \item \htmlref{History of PostgreSQL}{history}
    \item \htmlref{Copyrights}{copyrights}
    \item \htmlref{Y2K statement}{y2k}
    \item \htmlref{PostgreSQL reserved key words}{keywords}
    \item \htmlref{Data types}{data_types}
    \item \htmlref{Functions}{pgfunctions}
    \item \htmlref{Quick guide of PostgreSQL commands}{sql_guide}
    \item \htmlref{Inheritance}{inheritance}
    \item \htmlref{Multi-Version Concurency Control}{mvcc}
\end{itemize}