Question

What are the two ways of assigning a primary key

Answer 1

Answer:

Select the field or fields that you want to use as the primary key. To select one field, click the row selector for the field you want. To select more than one field to create a composite key, hold down CTRL and then click the row selector for each field. On the Design tab, in the Tools group, click Primary Key.

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Answer 2

Answer:

primary key must be not null.

primary key must be unique.