Imagine the ZIP code was instead a customer ID number in an order-tracking application.
假设ZIP代码被替换成了订单跟踪应用程序中的客户ID号码。
The example in Listing 21 creates a query that orders its result by name and then edits the query to order also by ZIP code.
清单21中的例子创建了一个根据名称对结果进行排序的查询，然后编辑该查询以根据邮政编码进行查询。
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