This Article 
   
 Share 
   
 Bibliographic References 
   
 Add to: 
 
Digg
Furl
Spurl
Blink
Simpy
Google
Del.icio.us
Y!MyWeb
 
 Search 
   
Fuzzy Database Query Languages and Their Relational Completeness Theorem
February 1993 (vol. 5 no. 1)
pp. 122-125

Two fuzzy database query languages are proposed. They are used to query fuzzy databases that are enhanced from relational databases in such a way that fuzzy sets are allowed in both attribute values and truth values. A fuzzy calculus query language is constructed based on the relational calculus, and a fuzzy algebra query language is also constructed based on the relational algebra. In addition, a fuzzy relational completeness theorem such that the languages have equivalent expressive power is proved.

[1] K. V. S. V. N. Raju and A. Majumdar, "Fuzzy functional dependencies and lossless join decomposition of fuzzy relational database systems,"ACM Trans. Database Syst., vol. 13, no. 2, June 1988.
[2] J. D. Ullman,Principles of Databases Systems. Rockville, MD: Computer Science Press, 1982.
[3] M. Umano, "Relational algebra in fuzzy database," IEICE Tech. Rep. DE86-4, (in Japanese) vol. 86, no. 192, pp. 1-8, 1986.
[4] M. Zemankova-Leech and A. Kandel, "Fuzzy relational databases--A key to expert systems," Verlag TÜV Rheinland GmbH, 1984.

Index Terms:
fuzzy database query languages; relational completeness theorem; fuzzy sets; attribute values; truth values; fuzzy calculus query language; relational calculus; fuzzy algebra query language; fuzzy set theory; information retrieval; query languages; relational databases
Citation:
Y. Takahashi, "Fuzzy Database Query Languages and Their Relational Completeness Theorem," IEEE Transactions on Knowledge and Data Engineering, vol. 5, no. 1, pp. 122-125, Feb. 1993, doi:10.1109/69.204096
Usage of this product signifies your acceptance of the Terms of Use.