Title :
On the extension of SQL to fuzzy bipolar conditions
Author :
Lietard, Ludovic ; Rocacher, Daniel ; Bosc, Patrick
Author_Institution :
IRISA/IUT, Lannion, France
Abstract :
The expression of user preferences into queries addressed to a relational database management system allows to obtain more appropriate answers. In this context, it is possible to consider fuzzy bipolar conditions which are made of two parts: (i) a fuzzy constraint to represent a mandatory requirement, (ii) a fuzzy wish to represent an optional requirement. Fuzzy constraints and fuzzy wishes express user preferences and are defined by fuzzy sets. This article is a first attempt to extend the relational algebra and the SQL language to bipolar fuzzy conditions.
Keywords :
SQL; fuzzy set theory; query processing; relational algebra; relational databases; SQL language; fuzzy bipolar conditions; fuzzy constraint; fuzzy sets; fuzzy wish; relational algebra; relational database management system; user preferences; Algebra; Conference management; Database languages; Fuzzy logic; Fuzzy sets; Fuzzy systems; Humans; Information processing; Possibility theory; Relational databases; flexible querying; fuzzy bipolar condition; relational database;
Conference_Titel :
Fuzzy Information Processing Society, 2009. NAFIPS 2009. Annual Meeting of the North American
Conference_Location :
Cincinnati, OH
Print_ISBN :
978-1-4244-4575-2
Electronic_ISBN :
978-1-4244-4577-6
DOI :
10.1109/NAFIPS.2009.5156411
