Description:

The PostgreSQL project provides a relational database management system (RDBMS) that offers the following:

• subqueries
• views
• foreign key constraints
• stored procedures
• triggers
• support for the SQL standards
• a query engine
• multiversion concurrency control

Additionally, it can be extended in many ways by adding new data types, functions, index methods, and more.

Usage Notes:

PostgreSQL derives from the POSTGRES package written at the University of California at Berkeley. With over a decade of development behind it, it is one of the most advanced databases available anywhere, open source or otherwise.

For applications that require a full-featured open source relational database, this is the one to use.