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doi:10.1016/j.infsof.2004.09.007 
Copyright © 2004 Elsevier B.V. All rights reserved.
Implementation of fuzzy classification in relational databases using conventional SQL querying
Received 7 December 2003.
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Abstract
In this paper, a framework for implementing fuzzy classifications in information systems using conventional SQL querying is presented. The fuzzy classification and use of conventional SQL queries provide easy-to-use functionality for data extraction similar to the conventional non-fuzzy classification and SQL querying. The developed framework can be used as data mining tool in large information systems and easily integrated with conventional relational databases. The benefits of using the presented approach include more flexible data analysis and improvement of information presentation at the report generation phase. To confirm the theory, a prototype was developed based on the stored procedures and database extensions of Microsoft SQL Server 2000.
Keywords: Information system; Fuzzy classification; SQL query; Relational database; Data mining
