Most DBMS products will let you define a primary key on a column that contains null values.

Name: Most DBMS products will let you define a primary key on a column that contains null values.
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Quizplus · Accepted Answer

Most DBMS products will not allow you to define a primary key on a column that contains null values because a primary key must uniquely identify each row in a table, and null values do not provide unique identification.

Most DBMS Products Will Let You Define a Primary Key