Constraints on a Single Relation not null primary key unique check(P),where Pis a predicate Database System Concepts,5th Edition,Oct 5.2006 4.9 @Silberschatz,Korth and SudarshanDatabase System Concepts, 5th Edition, Oct 5. 2006 4.9 ©Silberschatz, Korth and Sudarshan Constraints on a Single Relation not null primary key unique check (P ), where P is a predicate