The environment is the same, except that, instead of file cabinets, you have a microcomputer or a terminal and DBMS software that has access to a customer database file as shown in the following.

• 环境情况不变，只是取代文件柜的是你有了一台微机或者一台终端，以及可以访问顾客数据库文件的DBMS软件。数据库文件见下表。