The following database is for part of the business of a car repair shop. Briefly, the database is to keep track of the day's service requests, service history of cars that it had serviced, the supervisors who oversee the services, the qualifications of technicians, and the evaluation reports that supervisors write about technicians. Specific details are: 1. Every car is described by: A unique VIN, registration plate number, make, model, and year. 2. When a car is brought to the shop, a service order (which contains one or more jobs - see next) is prepared for the visit. The service order is described by: A unique order number, date, current mileage, customer name, and customer phone number. Also, the cost of the service order is recorded at the end of service. 3. The shop performs a number of standard jobs (e.g. wheel balancing, radiator flush, etc.). Every job is described by: A unique job id, time required, and cost. 4. Every service order is assigned to a supervisor who oversees the performing of the repair jobs listed in it. Every supervisor is described by: A unique supervisor id, and name. 5. Every technician is described by: A unique id, name, and level of expertise (e.g. high, medium, low) for every standard job for which he is certified. Also, every technician is certified for at least one standard job, and there is at least one certified technician for every standard job. In addition, some technicians act as mentors for other technicians whereby a mentored technician can have, at most, one mentor while a mentor may mentor several technicians. 6. Supervisors write frequent reports about individual technicians. A report contains the date, supervisor ID, technician ID, and a description. A supervisor will not write more than one report about a particular technician on any given date. However, it is possible that different supervisors may write different reports about the same technician on the same day. The following is simply a skeleton; add whatever is necessary to it.

The following database is for part of the business of a car repair shop. Briefly, the database is to keep track of the day's service requests, service history of cars that it had serviced, the supervisors who oversee the services, the qualifications of technicians, and the evaluation reports that supervisors write about technicians. Specific details are: 1. Every car is described by: A unique VIN, registration plate number, make, model, and year. 2. When a car is brought to the shop, a service order (which contains one or more jobs - see next) is prepared for the visit. The service order is described by: A unique order number, date, current mileage, customer name, and customer phone number. Also, the cost of the service order is recorded at the end of service. 3. The shop performs a number of standard jobs (e.g. wheel balancing, radiator flush, etc.). Every job is described by: A unique job id, time required, and cost. 4. Every service order is assigned to a supervisor who oversees the performing of the repair jobs listed in it. Every supervisor is described by: A unique supervisor id, and name. 5. Every technician is described by: A unique id, name, and level of expertise (e.g. high, medium, low) for every standard job for which he is certified. Also, every technician is certified for at least one standard job, and there is at least one certified technician for every standard job. In addition, some technicians act as mentors for other technicians whereby a mentored technician can have, at most, one mentor while a mentor may mentor several technicians. 6. Supervisors write frequent reports about individual technicians. A report contains the date, supervisor ID, technician ID, and a description. A supervisor will not write more than one report about a particular technician on any given date. However, it is possible that different supervisors may write different reports about the same technician on the same day. The following is simply a skeleton; add whatever is necessary to it.

A Guide to SQL

9th Edition

ISBN:9781111527273

Author:Philip J. Pratt

Publisher:Philip J. Pratt

Chapter2: Database Design Fundamentals

Section: Chapter Questions

Problem 11RQ

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