On the use of fuzzy numbers in flexible querying

Author

Rocacher, Daniel

Author_Institution

IRISA/ENSSAT, Lannion, France

Volume

4

fYear

2001

fDate

25-28 July 2001

Firstpage

2440

Abstract

An issue in extending database management functionalities is to increase the expressiveness of query languages. Flexible querying enables users to express preferences inside requirements and priorities inside compound queries. The answers are then qualified and sorted out. The fuzzy set theory offers a general framework for dealing with flexible queries. Moreover, the bag structure plays an important role in databases. Systems taking into account both flexible queries and bags introduce a new concept: fuzzy bags. A new approach of this concept, based on the notion of fuzzy cardinality, is presented in this paper. The use of fuzzy bags and fuzzy cardinalities in flexible querying is also introduced

Keywords

database theory; fuzzy set theory; query languages; query processing; bag structure; compound queries; database management functionalities; flexible querying; fuzzy bags; fuzzy cardinality; fuzzy numbers; fuzzy set theory; query language expressiveness; user preferences; user priorities; user requirements; Database languages; Fuzzy set theory; Fuzzy sets; Fuzzy systems; Image databases; Multimedia databases; Object oriented databases; Relational databases; Remuneration; Spatial databases;

fLanguage

English

Publisher

ieee

Conference_Titel

IFSA World Congress and 20th NAFIPS International Conference, 2001. Joint 9th

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-7078-3

Type

conf

DOI

10.1109/NAFIPS.2001.944455

Filename

944455