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Primary Keys

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.


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