February 2005
Beginner to intermediate
540 pages
14h 9m
English
Content preview from Fuzzy Modeling and Genetic Algorithms for Data Mining and Exploration
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Chapter 6 Fuzzy SQL and Intelligent Queries
Secondary Identifier (or Key)
Any indexed column is known as a secondary identifier. Secondary iden-
tifiers play an important role in data modeling, query, and organization.
6.2 Basic Relational Database Concepts
In the 1970s the concept of a relational database emerged as the standard
way of representing large quantities of complex information. Unlike the
previous generation of database systems, the relational model did not
rely on embedded pointers, links, and other internal structural edifices
to maintain relationships between data elements. Instead of links and
pointers, a relational database creates
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