Once a field has been specified as a primary key, Visual Basic will not allow that field to contain an empty entry for any record.

Name: Once a field has been specified as a primary key, Visual Basic will not allow that field to contain an empty entry for any record.
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Once a field is specified as a primary key, it becomes a unique identifier for each record in the table and cannot contain null or empty values.

Once a Field Has Been Specified as a Primary Key