Chapter 9

Codd’s Rules for Relational DBMSs


This chapter examines each of Codd’s rules for a “fully relational” database design. The discussion presents practical reasons for adhering to the rules. It also looks at why, in some cases, the rules have to be extended to include developments in database technology since the rules were first published.


E.F. Codd
Codd’s rules
rules for relational databases
relational database design
relational database design rules
In October 1985, E. F. Codd published a series of two articles in the computer industry weekly called Computerworld. The first article laid out 12 (or 13, depending on how you count them) criteria to which a “fully relational” database should adhere. The second article compared ...

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