Fun fact: Ingres was the brainchild of the brilliant Professor Michael Stonebraker. After the company went under after being beaten by Oracle in the RDBMS marketplace, he open-sourced the DB as a shot against Larry Ellison. Hence it’s name, “Post-Ingres”, or Postgres.

Also, I believe his version of SQL was called QUEL, and we would have been using that term today had Ingres won out.