PostgreSQL

PostgreSQL 9.6

Free
An advanced, open source object-relational database system
3.9  (30 votes)
4.2
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PostgreSQL is an open source cross-platform object-relational database system, which has been in 15 years of active development. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL:2008 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP.

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