2012•Journal of Computer Science and CyberneticsOpen access

On functional dependencies and multivalued dependencies in fuzzy relational databases.

Hò Thuân, Trần Thiện Thành

Abstract

In this paper, we present a new definition of fuzzy functional depencency and fuzzy multivalued dependency based on similarity in fuzzy relational database, for which thresholds are defined for each attributes of relation scheme.The soundness and completeness of inference rules, similar to Armstrong's axioms are proved.Tom tlit.Trong bai bao nay chiing tai trlnh bay dinh nghia cho phu shuoc ham va phu thuoc da tr] me)" tren me hlnh CO" so' dir li~u mo' du'a tren quan h~t u'ong tv' voi ngu'o'ng t u'o'ng tv' xac dinh rieng cho m6i thucc tinh.Tinh xac ding va day dii cila h~tien de t uo'ng tv' h~t ien de Armstrong ciing dtro'c chu'ng minh.

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Key concepts: Dependency theory (database theory), Functional dependency, Relational database, Computer science, Fuzzy logic, Database, Data mining, Theoretical computer science