What Do You Mean By PostgreSQL?

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What do you Mean By PostgreSQL?
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An object-relational Database Management and a
general purpose system otherwise called as
PostgreSQL is the latest open source database
system. Postgres 4.2 at Berkeley Computer Science
Department, University of California was the
basis of the development of PostgreSQL.For
running on UNIX-like platforms the program
designed was called as PostgreSQL. It has a good
portability with varied platforms like Mac OS X,
Windows, and Solaris. It is a free and open
source software. A free open source license
called as Postgre license has its source code.
PostgreSQL can be easily modified, used, and
distributed into any form.
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• Highlights of PostgreSQL Features
• There are many advanced features of PostgreSQL
  that has to be offered by other database
  management systems, like
• Sophisticated locking mechanism
• Multi-version concurrency control (MVCC)
• User-defined types
• Asynchronous replication
• Foreign key referential integrity
• Rules, subquery, views

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• How is PostgreSQL Different?
• Implementation of multi-version concurrency
  control of PostgreSQL is the first database
  management system even before Oracle. A snapshot
  isolation in Oracle has the MVCC feature. An
  object-relational database management and a
  general-purpose system, PostgreSQL helps you to
  add custom functions developed using programming
  languages like C/C, Java, etc.

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• PostgreSQL Usage
• People who use PostgreSQL 
• There are some products and solutions built by
  some companies with the help of PostgreSQL.
  Apple, Fujitsu, Red hat, Juniper Network, Cisco,
  etc. are some of the featured companies. There
  are some of the sections that complete the list
  of organizations for using PostgreSQL just check
  it out with the PostgreSQL featured users.
• There are some fundamental topics in PostgreSQL
  like
• PostgreSQL Select
• PostgreSQL Order By

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