Historical version. PostgreSQL 6.4 has reached end of support. See the current manual.
Summary
Postgres, developed originally in the UC Berkeley Computer Science Department, pioneered many of the object-relational concepts now becoming available in some commercial databases. It provides SQL92/SQL3 language support, transaction integrity, and type extensibility. PostgreSQL is a public-domain, open source descendant of this original Berkeley code.
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Read the upstream documentation. For corrections, first check the current manual.