November 2008
Intermediate to advanced
592 pages
20h 13m
English
Content preview from Introduction to Database SystemsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix D
E. F. Codd’s Rules
The original concept for the relational model was proposed by Dr. E. F. Codd in 1970. Later Dr. Codd clarified his model by defining twelve rules (Codd’s Rules) that a database management system must meet in order to be considered a relational database. These rules were very useful for evaluating a relational system. The Codd’s twelve rules are discussed below preceded by the rule zero.
Rule zero: This rule states that all subsequent rules are based on the notion that in order for a database to be considered relational, it must use its relational facilities exclusively to manage the database.
Rule 1: The information rule: This rule simply requires all information in the database to be represented in one and only ...
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