Explain why the addition of not null constraints to the sql, Database Management System

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Explain why the addition of not null constraints to the sql

Explain why the addition of NOT NULL constraints to the SQL definition of the Manages relation would not enforce the constraint that each department must have a manager. What, if anything, is achieved by requiring that the ssn field of Manages be non-null?

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Database Management System: Explain why the addition of not null constraints to the sql

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Database Management System: Explain why the addition of not null constraints to the sql

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