Design of Fuzzy Databases to Avoid Update Anomalies

  • Guoqing Chen
Part of the The Springer International Series on Advances in Database Systems book series (ADBS, volume 15)


Many real-world applications require regular maintenance and frequent updates of various databases used in information processing, decision making and problem solving. With fuzzy relational databases as described in Chapter 6, imprecision in attribute values as well as closeness in domain elements can be represented, stored, accessed, and modified. This is of great significance to all managerial levels of applications. For instance, at the strategic level, top executives may often have to face uncertain environments and work with imprecise assessments of competitive advantages, risks, and long-term perspectives. At the management level, middlelevel managers may often be concerned with customer relations, marketing targets, production planning, and projects management, which usually involve estimates, heuristics, partial knowledge and incomplete information at various degrees. At the operational level, the performance of production and process control may heavily rely on the measurement of machinery, the availability of control data, and more importantly, the experiences and skills of human operators, who often need to cope with complex situations involving uncertainty and imprecision.


Fuzzy Logic Normal Form Relation Scheme Minimal Cover Scheme Decomposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Chen, Guoqing. Design of Fuzzy Relational Databases Based on Fuzzy Functional Dependency. Ph.D. Dissertation Nr.84, K. U. Leuven (Belgium), 1992.Google Scholar
  2. Date, C. J. An Introduction to Database Systems. 4th ed Vol. 1 Addison-Wesley, 1986.Google Scholar
  3. Ullman, Jeffrey D. Principles of Database Systems. Maryland: Computer Sciences Press Inc. 1982.zbMATHGoogle Scholar
  4. Ullman, Jeffrey D. Principles of Database and Knowledge-Based Systems. Maryland: Computer Sciences Press Inc. 1988.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Guoqing Chen
    • 1
  1. 1.School of Economics and ManagementTsinghua UniversityBeijingChina

Personalised recommendations