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(a) List superkeys and candidate keys of the following relation schemas of hospital database, Doctors (DoctorID, email, Name, MailingAddress, Salary) Patient (PatientID, SSN, name, address)

(a) List superkeys and candidate keys of the following relation schemas of hospital database,

Doctors (DoctorID, email, Name, MailingAddress, Salary)

Patient (PatientID, SSN, name, address)

VisitingRecords(PatientID, DoctorID, dateOfVisit)

(b) Write a relational expression to find names of the patients who have seen the doctor with ID = 43457

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