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Jeffrey K. Tyzzer
-- USA



Real Name:  Jeffrey Tyzzer
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Joined: Apr 2007 (12 years ago)
Visits: 1
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Jeffrey K. Tyzzer
1. Data Normalization - The Normal Forms

by Jeffrey K. Tyzzer. In 1970, Dr. E.F. Codd's seminal paper "A Relational Model for Large Shared Databanks" was published in Communications of the ACM. This paper introduced the topic of data normalization, so-named because, at the time, President Nixon was normalizing relations with China.

Data normalization is a technique used during logical data modeling to ensure that there is only one way to know a fact, by removing all structures that provide more than one way to know the same fact as represented in a database relation (table). The goal of normalization is to control and eliminate redundancy, and mitigate the effects of modification anomalies -- which are generally insertion and deletion anomalies. (Insertion anomalies occur when the storage of information about one attribute requires additional information about a second attribute. Deletion anomalies occur when the deletion of one fact results in the loss of a second fact).

Normalization
There are six generally recognized normal forms of a relation: first normal form, second normal form, third normal form, Boyce/Codd normal form, fourth normal form, and fifth normal form, also called projection/join normal form. Other normal forms (e.g., Domain/Key) exist but will not be discussed here. The normal forms are hierarchical, i.e., each normal form builds upon its predecessor. Although many people consider a relation to be normalized only when it is in third normal form, technically speaking, a relation in only first normal form can be considered...

Posted to KB Topic: DBA & Data
17 years ago, and updated 11 years ago

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DBA, Databases, & Data

Jeffrey K. Tyzzer
2. Data Element Naming Standard This paper articulates the standard for naming data elements (entity attributes).
Posted to KB Topic: DBA & Data
17 years ago, and updated 12 years ago
(3 Comments )

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Nothing New Since Your Last Visit
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DBA, Databases, & Data

Jeffrey K. Tyzzer
3. Corporate Database Administration Corporate database admin standard first published by Prestwood Software in 1996.
Posted to KB Topic: DBA & Data
17 years ago, and updated 12 years ago

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DBA, Databases, & Data
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