A primary key field should never allow full values.

Name: A primary key field should never allow full values.
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Quizplus · Accepted Answer

A primary key field should never allow null values because it is used to uniquely identify each record in a table. If a primary key field can contain null values, then it is possible for two or more records to have the same primary key value, which would violate the uniqueness constraint.

A Primary Key Field Should Never Allow Full Values