The DBTG CODASYL Model All links are treated as many-to-one relationships. To model many-to-many relationships,a record type is defined to represent the relationship and two links are used. customer-streef account-number balance customer-name customer-city customer depositor account (a)E-R diagram customer-name customer-street customer-city account-number balance customer account CustRInk AcctRInk Rlink (b)Data structure diagram Database System Concepts,5th Ed. A.8 ©Silberschat乜，Korth and SudarshanDatabase System Concepts, 5 A.8 ©Silberschatz, Korth and Sudarshan th Ed. The DBTG CODASYL Model All links are treated as many-to-one relationships. To model many-to-many relationships, a record type is defined to represent the relationship and two links are used