An extension of classical functional dependency: dynamic fuzzy functional dependency
Relational data model has constituted an incontestable success in database history. In this context, a lot of attention has been paid to functional dependencies due to their paramount importance in the design of relational database. For about fifteen years, several attempts to formalize (soft) real world constraints imposed on the data has been made, leading to the emergence of the concept of fuzzy functional dependency. In this paper, an overview of the different proposals of the fuzzy functional dependency is presented. A new extension of classical functional dependency based on the Lukasiewicz implication is presented and called dynamic fuzzy functional dependency. The associated axiomatic system is introduced and proved to be sound.
fuzzy functional dependency lukasiewicz implication fuzzy relational data model