Question: 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

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 notchosen to be the key field of that table?

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