An Approach for Normalizing Fuzzy Relational Databases Based on Join Dependency

摘要

Fuzziness in databases is used to denote uncertain or incomplete data.Relational Databases stress on the nature of the data to be certain. Thiscertainty based data is used as the basis of the normalization approachdesigned for traditional relational databases. But real world data may notalways be certain, thereby making it necessary to design an approach fornormalization that deals with fuzzy data. This paper focuses on the approachfor designing the fifth normal form (5NF) based on join dependencies for fuzzydata. The basis of join dependency for fuzzy relational databases is derivedfrom the basic relational database concepts. As join dependency implies anmultivalued dependency by symmetry the proof of join dependency basednormalization is stated from the perspective of multivalued dependency basednormalization on fuzzy relational databases.