What is a derived (artificial) primary key
What is a derived (artificial) primary key? When must this be used?
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Using a name like the primary key violates the principle of stability. The social security number may be a valid choice, other than a foreign employee may not have a social security number. It is a case where a derived, quite than a natural, primary key is suitable. A derived key is an artificial key which you create. A natural key is one which is already part of the database.
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