Version 3 had support for multiple storage managers, a query executor was improved, rule system was rewritten.

In June 1989, Version 1 was released to some external users. In 1987 the first demo version of the project is released. In 1986 the Defense Advanced Research Projects Agency (DARPA), the Army Research Office (ARO), the National Science Foundation (NSF), and ESL, Inc sponsored Berkeley POSTGRES Project which was led by Michael Stonebraker. There is also the requirement that this copyright appears in all copies of the software. The only restriction is that you not hold them legally liable for problems with the software. Basically, it allows users to do anything they want with the code, including reselling binaries without the source code. PostgreSQL is distributed under a license similar to BSD and MIT. The PostgreSQL Core Team (A committee of five to seven (currently six) senior contributors.) generally act as spokespeople for the PGDG. The 'PGDG' is an international, unincorporated association of individuals and companies who have contributed to the PostgreSQL project. It is a community project and is not controlled by any company. PostgreSQL development is performed by a team of mostly volunteer developers spread throughout the world and communicating via the Internet. PostgreSQL is an object-relational database management system (ORDBMS).

PostgreSQL is claimed to be the most advanced open source database solution. No particular programming experience is required. We only assume some general knowledge on DBMS and SQL language. This tutorial is designed to give details to PostgreSQL, relational database concepts, and the SQL language.

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