The functional dependency in data is an important topic in the theory of relational databases.Similarly
the functional dependency also existed in the DF relational database.First
based on dynamic fuzzy relation
dynamic fuzzy relational data model is presented;the representation of dynamic fuzzy data value is introduced.Then
dynamic fuzzy functional dependency is represented by means of dynamic fuzzy equivalent relation and its membership function;the inference rules for dynamic fuzzy functional dependency are described and proved.Finally
the normalization design of dynamic fuzzy relations is discussed.