POSTGRESQL'S ancestor was INGRES, developed at the UNIVERSITY OF CALIFORNIA AT BERKELEY (1977-1985). The Ingres code was taken and enhanced by RELATIONAL TECHNOLOGIES/INGRES CORPORATION3.1, which produced one of the first commercially successful relational database servers. Also at Berkeley, MICHAEL STONEBRAKER lead a team to develop an object-relational database server called POSTGRES (1986-1994). The Postgres code was taken by ILLUSTRA3.2 and developed into a commercial product. Two Berkeley graduate students, JOLLY CHEN and ANDREW YU, added SQL capabilities to Postgres, and called it POSTGRES95 (1994-1995). They left Berkeley, but Chen continued maintaining POSTGRES95, which had an active mailing list.