http://docs.sun.com/app/docs/doc/819-2183/6n4g726uc?a=view
PostgreSQL for the Solaris OS
This additional software is new in the Solaris Express 4/06 release.
PostgreSQL is a relational database system provided in the open-source community. More than 15 years of active development and a proven architecture have earned PostgreSQL a reputation for reliability, data integrity, and accuracy.
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