Relationship Sets A relationship is an association among several entities Example: Hayes depositor A-102 customer entity relationship set account entity A relationship set is a mathematical relation among n>2 entities,each taken from entity sets {(e1,e2,.en)le1∈E1,e2∈E2,…,en∈En} where(e1,e2,...,e)is a relationship Example: (Hayes,A-102)E depositor Database System Concepts-5th Edition,Oct 5,2006 6.5 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 6.5 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 Relationship Sets A relationship is an association among several entities Example: Hayes depositor A-102 customer entity relationship set account entity A relationship set is a mathematical relation among n  2 entities, each taken from entity sets {(e1 , e2 , … en ) | e1  E1 , e2  E2 , …, en  En } where (e1 , e2 , …, en ) is a relationship Example: (Hayes, A-102)  depositor