Flexible Database Querying Based on Ordered Lattice Theory Extension
Minyar Sassi1, Amel Touzi1, and Habib Ounelli2
1Ecole Nationale d’Ingénieurs de Tunis, Tunisia
2Faculté des Sciences de Tunis, Campus Universitaire-1060 Tunis, Tunisia
Abstract: This research reports on the synthesis of flexible database querying approach based on ordered lattice theory extension to deal with imprecise and structured data. This approach allows us to construct a multi-attributes type abstraction hierarchy structure for the case of decomposition according several attributes. This structure is defined from an ordered lattice theory extension. Our approach consists of two steps: the first step consists in data organization and the second at seeking, to interrogate them, relevant data sources for a given query. The contributions of this approach are a) the interdependence of the query research criteria, b) the research of the relevant data sources for a given query, and d) the scheduling of the results.
Keywords: Fuzzy cluster analysis, formal concept analysis, flexible database querying, concept query, relieving query.
Received March 3, 2007; accepted June 13, 2007