When the Sports Physical Therapy database was created, the database designers identified PatientNum and PatientSocialSecurityNumber as candidate

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When the Sports Physical Therapy database was created, the database designers identified PatientNum and PatientSocialSecurityNumber as candidate keys for the Patient table. Why was PatientSocialSecurityNumber not chosen to be the key field of that table?

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Concepts Of Database Management

ISBN: 9780357422083

10th Edition

Authors: Lisa Friedrichsen, Lisa Ruffolo, Ellen Monk, Joy L. Starks, Philip J. Pratt

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