киллер промахнулся :DDDDDDDDDDDнаучись хотя бы в инете читать:
Ingres (pronounced /iŋ-grεs'/) is a commercially supported, open-source relational database management system. Ingres was first created as a research project at the University of California, Berkeley starting in the early 1970s and ending in the early 1980s. The original code, like that from other projects at Berkeley, was available at minimal cost under a version of the BSD license.
!!!Since the mid-1980s, Ingres has spawned a number of commercial database applications, including Sybase, Microsoft SQL Server, NonStop SQL and a number of others.!!!
PostgreSQL кстати, НЕ использовал код Ingres - он писался по другой методологии. И попробуй освоить поиск в инете, хотя бы тот же google, поищи про Illustra etc.