Mapping Cardinalities A B A B b1 01 al b2 02 2 03 03 04 bs (a) (b) One to one One to many Note:Some elements in A and B may not be mapped to any elements in the other set Database System Concepts -5th Edition,Oct 5,2006 6.12 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 6.12 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 Mapping Cardinalities One to one One to many Note: Some elements in A and B may not be mapped to any elements in the other set