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.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Draw a clear and complete ER.
Transcribed Image Text: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:
2.
1. Every car is described by: A unique VIN, registration plate number, make, model, and year.
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.
Supervisor
Technician
Car
ServiceOrder
Job
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