A key is a field that serves a specific function within a table. Several types of keys are important, but for now, I want to focus on the primary key. In the next few chapters, I discuss the primary key at length, and you will spend a great deal of time selecting and using primary keys. But I introduce the concept now for three reasons:
It exposes you to fields with the AutoNumber data type, thus rounding out our discussion of data types.
It hints at what distinguishes Access tables from other tables you've worked with.
I want to make sure that you don't get hung up on the primary key concept.
The last objective most concerns me. Early on, new Access users are exposed to primary keys and usually find them confusing. Here's a typical ...