1-List the SSNs of PERSONs who are not doctors or patient

2- for each doctor list the doctor's name and specialty and the total number of patient seen by that doctor

3-list the doctor who has the maximum number of patients

Write in the relational algebra and in SQL the following queries. (6.5 points) Consider the following relational database conceptual schema used to keep track of patient visits in a medical clinic. Note that a PERSON may be a doctor or a patient: PERSON (SSN Name, DoB, Gender, PlaceOfBirth) DOCTOR (DSSN Specialty) PATIENT (PSSN, InsurancelD, Insurance Provider, Medical RecordID) MEDICALVISIT (Date, DSSN, PSSN, Diagnosis)