PostgreSQL is an object-relational database management system (ORDBMS) that is ACID-compliant and transactional. PostgreSQL has updatable views and materialized views, triggers, foreign keys; supports functions and stored procedures, and other expandability. It is free and open-source, released under the terms of the PostgreSQL License. Know-how: Foreign data wrappers, JDBC interface, psycopg2 (Python interface), pyODBC (Python library), php5-pgsql (PHP driver based on libpq), RPostgreSQL (R interface), epgsql (Erlang interface), Ora2Pg, phpPgAdmin, pgDevOps, PostgreSQL console.PostgreSQL