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Autonumbering and identifier columns

For each table, a single identifier column can be created that contains system-generated sequential values that uniquely identify each row within the table. Identifier columns usually contain values unique within the table on which they are defined. This means that other tables containing identifier columns can contain the same identity values used by another table. However, this is usually not a problem because the identifier values are typically  used only within the context of a single table, and the identifier columns do not relate to other identifier columns in other tables.

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How to change columns in an existing table

Table Designer

Adding and Deleting Fields

Column Data Types

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Indexes and primary keys


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