On fuzzy bags and their application to flexible querying

摘要: An issue in extending database management functionalities is to increase the expressiveness of query languages. Flexible querying enables users express preferences inside requirements and priorities compound queries. The answers are then qualified sorted out. fuzzy sets theory offers a general framework for dealing with flexible Moreover bag type plays an important role databases. Systems taking into account both queries bags define bags. A new approach this concept, based on notion cardinalities, presented paper. Fuzzy cardinalities provide which different collection types: set, treated uniform way can be composed. We show how they used build up manipulate quantitative qualitative information elements collections.