We're talking about databases again. Or database management systems, we're not totally sure. In any case, they are relational databases (or database management systems).
The relational database has been the go-to system for storing structured data since the 1980s, and is still the most popular type of system to use for applications and business reporting. We discuss their history, what makes them relational, and our experiences with some of the better known commercial and open-source relational systems.
A Relational Model of Shared Databanks - EF Codd
Dr. Michael Stonebraker - A Short History of Database Systems
