Edgar F. Codd, English computer scientist, inventor of relational model of data (died 2003)

Edgar Frank "Ted" Codd was a British computer scientist who, while working for IBM, invented the relational model for database management, the theoretical basis for relational databases and relational database management systems.

The relational model (RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by English computer scientist Edgar F. Codd, where all data are represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.

August 19 is the 231st day of the year in the Gregorian calendar; 134 days remain until the end of the year.