I. Tutorial
    Welcome to the PostgreSQL Tutorial.  The
    following few chapters are intended to give a simple introduction
    to PostgreSQL, relational database
    concepts, and the SQL language to those who are new to any one of
    these aspects.  We only assume some general knowledge about how to
    use computers.  No particular Unix or programming experience is
    required.  This part is mainly intended to give you some hands-on
    experience with important aspects of the
    PostgreSQL system.  It makes no attempt
    to be a complete or thorough treatment of the topics it covers.
   
    After you have worked through this tutorial you might want to move
    on to reading Part II to gain a more formal knowledge
    of the SQL language, or Part IV for
    information about developing applications for
    PostgreSQL.  Those who set up and
    manage their own server should also read Part III.