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summary: "object-relational SQL database (supported version)"
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PostgreSQL is a fully featured object-relational database management
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system. It supports a large part of the SQL standard and is designed
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to be extensible by users in many aspects. Some of the features are:
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ACID transactions, foreign keys, views, sequences, subqueries,
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triggers, user-defined types and functions, outer joins, multiversion
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concurrency control. Graphical user interfaces and bindings for many
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programming languages are available as well.