In spreadsheet formula bar is located between the Ribbon and Workspace.
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In spreadsheet formula bar is located between the RIBBON and WORKSPACE.
for a primary key to work well, the field must uniquely identify each row, never contain an empty or null value, and rarely (ideally, never) change. to set the primary key:
open the database that you want to modify.
in the navigation pane, right click the table in you want to set the primary key and, on the shortcut menu, click design view.
tip: if you don't see the navigation pane, press f11 to display it.
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.
tools group on the design tab
a key indicator is added to the left of the field or fields that you specify as the primary key.
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