The problem scenario You are asked to design a database for a company that operates driving schools at several cities in your home city. It is to store information about the driving schools, clients, instructors, cars and details of bookings for driving lessons and tests. A driving school has a unique ID and address. It employs several driving instructors and some administration staff with various job roles, e.g. manager, secretary, assistant. All members of staff have a unique ID, forename, surname, gender, contact phone number, address. Instructors have a valid driving license number recorded, other members of staff have their role recorded. Each instructor is allocated a specific car by the school. Each car has a numeric identifier, a registration number and model. A client has a unique ID, forename, surname, gender, date of birth, address, contact phone number, and a provisional driving license number. After clients register with a driving school near where they live, they may book individual lessons with a particular instructor in the school. Each lesson lasts for an hour. A client may change to a different instructor at any stage. A client may apply for a driving test at the nearest test centre. Each centre has a unique ID, name, address and contact phone number. A client may make multiple attempts to pass the test. For each test, the instructor should be available to drop off and pick up the client before and after the test at the centre. If a client fails a test, the reasons for failure must be recorded.

Task

Produce a logical data model for a relational database. Map your conceptual data model (Check my previously posted question) to a relational schema, indicating clearly the primary keys and any foreign keys introduced to model the relations and constraints. Represent the schema in textual form. For each foreign key, specify whether a null value would be allowed. State which attributes may be null.State any other required constraints for your logical data model.