Enriching vague queries by fuzzy orderings

The Vague Query System (VQS) due to Kiing and Palkoska is an add-on to rela- tional databases which is able to suggest alternative query results in case that an exact query fails. This is accomplished by taking numeric distances into account and, consequently, works only for queries with vague equality conditions. In this paper, we present a concept for extending VQS such that queries with vague ordering conditions can also be supported.

[1]  Patrick Bosc,et al.  Fuzzy databases : principles and applications , 1996 .

[2]  Amihai Motro,et al.  VAGUE: a user interface to relational databases that permits vague queries , 1988, TOIS.

[3]  B. Baets,et al.  Pseudo-metrics and T-equivalences , 1997 .

[4]  F. Klawonn Fuzzy sets and vague environments , 1994 .

[5]  Frank Klawonn,et al.  Foundations of fuzzy systems , 1994 .

[6]  Josef Küng,et al.  VQS-a vague query system prototype , 1997, Database and Expert Systems Applications. 8th International Conference, DEXA '97. Proceedings.

[7]  Bobby Schmidt,et al.  Fuzzy math , 2001 .

[8]  Josef Küng,et al.  Vague joins-an extension of the vague query system VQS , 1998, Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130).

[9]  Josef Küng,et al.  Vague Queries in Tourism Information Systems , 2000 .

[10]  Ulrich Bodenhofer,et al.  A Similarity-Based Generalization of Fuzzy Orderings Preserving the Classical Axioms , 2000, Int. J. Uncertain. Fuzziness Knowl. Based Syst..

[11]  Masahito Hirakawa,et al.  ARES: A relational database with the capability of performing flexible interpretation of queries , 1986, IEEE Transactions on Software Engineering.