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Given the following relations: Patient (patno, name, add, ssno, driverno) Staff (staffno, name, add, ssno, driverno) Doctor (docno, name, add, ssno, driverno) Admission (roomno, patno startdate, enddate, staffno) Room (roomno, type, fee) Drug (drugno, drugname, drugsalesprice, drugprice) Prescription (prescno, docno, patno, drugno, stardate, enddate) Answer the following queries in relational algebra. 1. A list of every staff number and number of admission handled by the staff. 2. A list of doctor number and doctor name who only subscibed drug name = vitamin C to patients with yesterday as starting date. 3. A list of staff number and staff name who has not been a patient. 4. A list of patient number and patient name who has never been admitted to stay in a hospital room. Given the following relations: Patient (patno, name, add, ssno, driverno) Staff (staffno, name, add, ssno, driverno) Doctor (docno, name, add, ssno, driverno) Admission (roomno, patno startdate, enddate, staffno) Room (roomno, type, fee) Drug (drugno, drugname, drugsalesprice, drugprice) Prescription (prescno, docno, patno, drugno, stardate, enddate) Answer the following queries in relational algebra. 1. A list of every staff number and number of admission handled by the staff. 2. A list of doctor number and doctor name who only subscibed drug name = vitamin C to patients with yesterday as starting date. 3. A list of staff number and staff name who has not been a patient. 4. A list of patient number and patient name who has never been admitted to stay in a hospital room