I have gotten some dates from the old Ingres and Postgres source code.
Interesting how old these are:
PostgreSQL is the most advanced open-source database server. It is Object-Relational(ORDBMS), and is supported by a
teamof Internet developers. PostgreSQL began as Ingres, developed at the University of California at
Berkeley(1977-1985). The Ingres code was taken and enhanced by Ingres Corporation, which produced one of the first
commerciallysuccessful relational database servers. (Ingres Corp. was later purchased by Computer Associates.) The
Ingrescode was taken by Michael Stonebraker as part of a Berkeley project to develop an object-relational database
servercalled Postgres(1986-1994). The Postgres code was taken by Illustra and developed into a commercial product.
(Illustrawas later purchased by Informix and integrated into Informix's Universal Server.) Several graduate students
added SQL capabilities to Postgres, and called it Postgres95(1995). The graduate students left Berkeley, but the code
wasmaintained by one of the graduate students, Jolly Chen, and had an active mailing list.
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