Q1(a). Draw the three level architecture diagram of database systems along with the corresponding mappings between different levels. Also define the terms logical level independence and physical level independence. [4] (b). Consider the table shown below and identify super keys (at least 3), composite candidate keys (at least 2) and a primary key. [6] The table shown in figure below lists some sample records of dentist/patient appointment data. A patient is given an appointment at a specific time and date with a dentist located at a particular surgery. On each day of patient appointments, a dentist is allocated to a specific surgery for that day. DentistName StaffNo Pat. Pat. Name App. Date No P100 Gillian White 12-Sep-04 App. Surgery Time No. 10.00 S15 Tony Smith S1011 Tony Smith P105 Jill Bell 12-Sep-04 12.00 S15 S1011 Helen Pearson P108 Ian Mackay 12-Sep-04 10.00 S10 S1024 Helen Pearson P108 lan Mackay 14-Sep-04 14.00 S10 S1024 Robin Plevin P105 Jill Bell 14-Sep-04 16.30 S15 S1032 Robin Plevin P110 John Walker 15-Sep-04 18.30 S13 S1032