Chapter 11 Database Management 11.2 DBMS STRUCTURING TECHNIQUES 1. List structures. In this logical approach, records are linked together by the use of pointers. a pointer is a data item in one record that identifies the storage location of another logically related record. Records in a customer master file, for example, will contain the name and address of each customer and each record in this file is identified by an account number during an accounting period, a customer may buy a number of items on different days. Thus, the company may maintain an invoice file to reflect these transactions 链表结构。在该逻辑方式中,记录通过指针链接在一起。指针是记录中的 个数据项,它指出另一个逻辑相关的记录的存储位置,例如,顾客主文件中 的记录将包含每个顾客的姓名和地址,而且该文件中的每个记录都由一个账 号标识。在记账期间,顾客可在不同时间购买许多东西公司保存一个发票文 件以反映这些交易。 《什第机专出美语 11-11Chapter 11 Database Management 计算机专业英语 11-11 11.2 DBMS STRUCTURING TECHNIQUES 1. List structures. In this logical approach, records are linked together by the use of pointers. A pointer is a data item in one record that identifies the storage location of another logically related record. Records in a customer master file, for example, will contain the name and address of each customer, and each record in this file is identified by an account number. During an accounting period, a customer may buy a number of items on different days. Thus, the company may maintain an invoice file to reflect these transactions. 链表结构。在该逻辑方式中，记录通过指针链接在一起。指针是记录中的一 个数据项，它指出另一个逻辑相关的记录的存储位置，例如，顾客主文件中 的记录将包含每个顾客的姓名和地址，而且该文件中的每个记录都由一个账 号标识。在记账期间，顾客可在不同时间购买许多东西,公司保存一个发票文 件以反映这些交易