An
open source RDBMS
that started as a research project at Berkeley in the 1970's. There are now
two strains of Ingres; the university Ingres (also known as Berkeley Ingres),
which is open source, and also a commercial version called OpenIngres, which
uses
SQL and some forms of QUEL as its language for
queries and database transactions. The university Ingres is believed to be the
first implementation of a relational database management system that pre-dates
IBM's
System R. Version 8.9 was the last public
release of University Ingres and it was discontinued in 1985. Ingres is also
written as
INGRES.