✦ LIBER ✦

On fuzzy bags and their application to flexible querying

✍ Scribed by Daniel Rocacher

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 318 KB
Volume: 140
Category: Article
ISSN: 0165-0114
DOI: 10.1016/s0165-0114(03)00029-0

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✦ Synopsis

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 qualiÿed and sorted out. The fuzzy sets theory o ers a general framework for dealing with exible queries. Moreover the bag type plays an important role in databases. Systems taking into account both exible queries and bags deÿne fuzzy bags. A new approach of this concept, based on the notion of fuzzy cardinalities, is presented in this paper. Fuzzy cardinalities provide a general framework in which di erent collection types: set, fuzzy set, bag and fuzzy bag are treated in a uniform way and can then be composed. We show how they can be used to build up exible queries and to manipulate both quantitative and qualitative information on the elements of collections.

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