This document is a "practical guide" to very quickly setup a SQL Database engine and front end tools on a Unix system. It also discusses the International standard language ANSI/ISO SQL and reviews the merits/advantages of the SQL database engine developed by the world-wide internet in an "open development" environment. It is about HOW-TO setup a next generation Object Relational SQL Database "PostgreSQL" on Unix system which can be used as a Application Database Server or as a Web Database Server. PostgreSQL implements a subset of International ISO/ANSI SQL standards of years 1998,92,89. This document also gives information on the database interface programs like Front End GUIs, RAD tools (Rapid Application Development), ODBC, JDBC drivers, "C", "C++", Java, Perl programming interfaces and Web Database Tools. Information given here applies to all Unix platforms and to all other SQL databases. It will be very useful for people who are new to Databases, SQL language and PostgreSQL. This document also has SQL tutorial, SQL syntax which would be very helpful for beginners. Experienced people will find this document as a useful reference guide. For students, the information given here will enable them to get the source code for PostgreSQL relational database system, from which they can learn as to how a RDBMS SQL database engine is created.