Functional Dependencies Constraints on the set of legal relations. Require that the value for a certain set of attributes determines uniquely the value for another set of attributes. A functional dependency is a generalization of the notion of a key. Database System Concepts-5th Edition,Oct 5,2006 7.11 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 7.11 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 Functional Dependencies Constraints on the set of legal relations. Require that the value for a certain set of attributes determines uniquely the value for another set of attributes. A functional dependency is a generalization of the notion of a key