A Multivalued Integrity Constraint in Fuzzy Relational Database
نویسندگان
چکیده
This paper introduces a new definition of fuzzy multivalued dependency, called α-fmvd, on the basis of the αequality of tuples as defined in [1]. Next the definition is shown to be consistent, i.e., it reduces to that of classical multivalued dependency (mvd) when the choice parameter takes the value one. Finally, a set of sound and complete inference axioms have been designed and proved for the α-fmvd. Copyright c © 2011 Yang’s Scientific Research Institute, LLC. All rights reserved.
منابع مشابه
An Extension of Semantic Proximity for Fuzzy Multivalued Dependencies in Fuzzy Relational Database
Following the development of fuzzy logic theory by Lotfi Zadeh, its applications were investigated by researchers in different fields. Presenting and working with uncertain data is a complex problem. To solve for such a complex problem, the structure of relationships and operators dependent on such relationships must be repaired. The fuzzy database has integrity limitations including data depen...
متن کاملAn Approach for Normalizing Fuzzy Relational Databases Based on Join Dependency
Fuzziness in databases is used to denote uncertain or incomplete data. Relational Databases stress on the nature of the data to be certain. This certainty based data is used as the basis of the normalization approach designed for traditional relational databases. But real world data may not always be certain, thereby making it necessary to design an approach for normalization that deals with fu...
متن کاملComprehensive Approach to the Design of Relational Database Schemes
We propose a new approach to the design of relational database schemes. The main features of the approach are: (4 A combination of the traditional decomposition and synthesis approaches, thus allowing the use of both functional and multivalued dependencies. (b) Separation of structural dependencies relevant for the design process from integrity constraints, i.e., constraints that do not bear an...
متن کاملMultivalued Dependencies and a 4NF for XML
While providing syntactic exibility, XML provides little semantic content and so the study of integrity constraints in XML plays an important role in helping to improve the semantic expressiveness of XML. Functional dependencies (FDs) and multivalued dependencies (MVDs) play a fundamental role in relational databases where they provide semantics for the data and at the same time are the foundat...
متن کاملAxiomatisation of fuzzy multivalued dependencies in a fuzzy relational data model
In "Axiomatisation of fuzzy multivalued dependencies in a fuzzy relational data model" [1), Bhattacharjee and Mazumdar have introduced an extension of classical multivalued dependencies for fuzzy relational data models. The authors also proposed a set of sound and complete inference rules to derive more dependencies from a given set of fuzzy multivalued dependencies. We are afraid an important ...
متن کامل