To maintain primary key integrity, a relational database designer will not allow a primary key to have a null (empty)value.

Name: To maintain primary key integrity, a relational database designer will not allow a primary key to have a null (empty)value.
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This is because the primary key is used to uniquely identify each record in the table, and having a null value would create ambiguity and make it difficult to ensure that each record is distinct.

To Maintain Primary Key Integrity, a Relational Database Designer Will