Edgar F. Codd. Edgar Frank "Ted" Codd (19 August 1923 – 18 April 2003) was an English computer scientist who, while working for IBM, invented the relational model for database management, the theoretical basis for relational databases.
He made other valuable contributions to computer science, but the relational model, a very influential general theory of data management, remains his most mentioned achievement.[6][7] Biography[edit] Codd's 12 rules. Codd's twelve rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F.
Codd worked under a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.e., a relational database management system (RDBMS).[1][2] They are sometimes jokingly referred to as "Codd's Twelve Commandments". Details[edit] Codd produced these rules as part of a personal campaign to prevent his vision of the relational database being diluted, as database vendors scrambled in the early 1980s to repackage existing products with a relational veneer.
Rule 12 was particularly designed to counter such a positioning. Introduction to R for SAS and SPSS Users Webinar.
SQL. XML.