Tuple Relational Calculus A nonprocedural query language,where each query is of the form tP(t)) It is the set of all tuples t such that predicate P is true for f t is a tuple variable,t [A]denotes the value of tuple t on attribute A t e r denotes that tuple t is in relation r P is a formula similar to that of the predicate calculus Database System Concepts-5th Edition,July 8,2005 5.3 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 5.3 ©Silberschatz, Korth and Sudarshan th Edition, July 8, 2005 Tuple Relational Calculus A nonprocedural query language, where each query is of the form {t | P (t ) } It is the set of all tuples t such that predicate P is true for t t is a tuple variable, t [A ] denotes the value of tuple t on attribute A t  r denotes that tuple t is in relation r P is a formula similar to that of the predicate calculus