On the navigation pane on the left, click the table that contains the field size you want to change. Then click the Design view. By default, Access will add a Primary key to your table ...

A Primary Key is a field that identifies each record in your table ... Before we take a break, let's add some records to our new table. In "Design View", go to "View => Datasheet View" in the menu bar ...

In the school example, the primary key used to identify each member of staff in the teacher table is Staff ID. A foreign key is a primary key from one table that appears in another table to link ...