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Difino
| • | Ingres (pronounced "ingress") 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 had spawned a number of commercial database applications, including Sybase, Microsoft SQL Server, NonStop SQL and a number of others. A follow-on project started in the mid-1980s as Postgres. This project lead to the development of PostgreSQL, which was commmercialized as Illustra, and the code was later incorporated into Informix. By any measure, Ingres is one of the most influential modern computer research projects.
Source: [wikipedia: ingres]
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