ABSTRACT
PostgreSQL is a free and open-source RDBMS that traces its roots to Ingres, one of the first RDBMS created. It strongly conforms to the ANSISQL-92/99 standards. There are several independent companies that offer support for PostgreSQL. There are commercial products that use PostgreSQL as an underlying database. CHORD, a commercial chemical cartridge for PostgreSQL, is sold by gNova.2 PgChem, an open-source cartridge for PostgreSQL, is available at SourceForge.3 RDKit also contains an open-source cartridge for PostgreSQL.4
