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PostgreSQL is an object-relational database management system (ORDBMS) of free software with very complete features. It is an object-relational database management system based on POSTGRES, version 4.2 developed by the Computer Department of the University of California. Many of the leading concepts of POSTGRES only appeared in the commercial website database at a relatively late time. PostgreSQL supports most of the SQL standards and provides many other modern features such as complex queries, foreign keys, triggers, views, transaction integrity, multi-version concurrency control, and more. Likewise, PostgreSQL can be extended in many ways, for example by adding new data types, functions, operators, aggregate functions, indexing methods, procedural languages, etc. Also, because of the flexibility of the license, anyone can use, modify, and distribute PostgreSQL for any purpose for free.
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