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PostgreSQL is a relational database manager system based on postgres version 4,2, developed in the department of Computer Sciences in the University of California at Berkeley. Postgres was a pioneer in many concepts that appeared much later in some of the commercial database systems.

PostgreSQL is a open source descendant of the original code of Berkeley. It supports SQL92 and SQL99 in addition to other modern characteristics, among them:

  • Complex queries
  • Foreign keys.
  • Triggers
  • Views
  • Transactional integrity.
  • Concurrency control multi-version.
Also, PostgreSQL can be extended by the user in several forms, for example adding:
  • Data types
  • Functions
  • Operators
  • Aggregation functions.
  • Procedure languages.
And because of its license, PostgreSQL can be used, modified and distributed by anyone free of position for any intention, private, commercial or academic.



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