8 Appendix D Network Model customer name customer_streef customer city account number balance customer account (a) customer_name customer street customer_city account_number balance customer account access date access date (b) Figure D.10 Two data-structure diagrams. .CustRInk from Rlink record type to customer record type AcctRInk from Rlink record type to account record type The corresponding data-structure diagram is as shown in Figure D.11b.An instance of a database corresponding to the described schema appears in Fig- ure D.12.We encourage you to compare this sample database with the one de- scribed in Figure D.4. If the relationship depositor is many to many with a descriptive attribute (for example,access date),then the transformation algorithm is similar to the one described.The only difference is that the new record type Rlink now contains the field access date. customer account customer name depositor account number customer street balance customer_city (a)E-R diagram customer_name customer_street customer_cify account_number balance customer accouni CustRInk AcctRInk Rlink (b)Data structure-diagram Figure D.11 E-R diagram and its corresponding data-structure diagram.8 Appendix D Network Model Figure D.10 Two data-structure diagrams. • CustRlnk from Rlink record type to customer record type • AcctRlnk from Rlink record type to account record type The corresponding data-structure diagram is as shown in Figure D.11b. An instance of a database corresponding to the described schema appears in Fig￾ure D.12. We encourage you to compare this sample database with the one de￾scribed in Figure D.4. If the relationship depositor is many to many with a descriptive attribute (for example, access date), then the transformation algorithm is similar to the one described. The only difference is that the new record type Rlink now contains the field access date. Figure D.11 E-R diagram and its corresponding data-structure diagram