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PostgreSQL is a sophisticated Object-Relational DBMS, supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. It is the most advanced open-source database available anywhere. Commercial Support is also available. The original Postgres code was the effort of many graduate students, undergraduate students, and staff programmers working under the direction of Professor Michael Stonebraker at the University of California, Berkeley. In 1995, Andrew Yu and Jolly Chen took on the task of converting the DBMS query language to SQL and created a new database system which came to known as Postgres95. Many others contributed to the porting, testing, debugging and enhancement of the Postgres95 code. As the code improved, and 1995 faded into memory, PostgreSQL was born. PostgreSQL development is presently being performed by a team of Internet developers who are now responsible for all current and future development. The development team coordinator is Marc G. Fournier (scrappy@PostgreSQL.ORG). Support is available from the PostgreSQL developer/user community through the support mailing list (questions@PostgreSQL.ORG). PostgreSQL is free and the complete source is available.

This is the port for all stuff that comes in the contrib subtree of the postgresql distribution. This subtree contains porting tools, analysis utilities, and plug-in features that are not part of the core PostgreSQL system, mainly because they address a limited audience or are too experimental to be part of the main source tree. This does not preclude their usefulness. Each subdirectory contains a README file with information about the module. Some directories supply new user-defined functions, operators, or types. After you have installed the files you need to register the new entities in the database system by running the commands in the supplied .sql file. For example, $ psql -d dbname -f module.sql The .sql files are installed into /usr/local/share/postgresql/contrib For more information, please see /usr/local/share/doc/postgresql/contrib/README* This software is part of the standard PostgreSQL distribution.

MySQL is a very fast, multi-threaded, multi-user and robust SQL (Structured Query Language) database server.

Pgeasy is a PostgreSQL API that is a cleaner interface to the libpq library, more like an SQL 4GL interface. There are examples in share/examples/postgresql/libpqeasy and docs in share/doc/postgresql/libpqeasy