1. Create an ERD for a car service facility. Base your design on the following business rules: • When a customer takes one or more cars in for repair or service, one service ticket is written for each car. • The ticket contains the needed and recommended services for the car. • A services book records the number of hours needed for each service based on the car model and year. • We maintain a service history for each of the cars serviced. The service records are referenced by the cars serial number. • A car brought in for service can be worked on by many mechanics, and each mechanic may work on many cars. We need to record the hour each mechanic on each car. • For each mechanics, we keep track of name, address, and the hourly wage. • A car that is serviced may or may not need parts (e.g., adjusting a carburetor or cleaning a fuel injector nozzle does not require providing new parts). • Parts can be bought by the customers and handed to the service facility, or the service facility can obtain these parts purchased and added it to the bill. • For each bill, we record the date and ticket corresponding to this bill, number of the total hours and the parts bought (if any), and the total cost of the bill. Draw an ER diagram that captures the preceding information. Identify any constraints not captured by the ER diagram.
1. Create an ERD for a car service facility. Base your design on the following business rules: • When a customer takes one or more cars in for repair or service, one service ticket is written for each car. • The ticket contains the needed and recommended services for the car. • A services book records the number of hours needed for each service based on the car model and year. • We maintain a service history for each of the cars serviced. The service records are referenced by the cars serial number. • A car brought in for service can be worked on by many mechanics, and each mechanic may work on many cars. We need to record the hour each mechanic on each car. • For each mechanics, we keep track of name, address, and the hourly wage. • A car that is serviced may or may not need parts (e.g., adjusting a carburetor or cleaning a fuel injector nozzle does not require providing new parts). • Parts can be bought by the customers and handed to the service facility, or the service facility can obtain these parts purchased and added it to the bill. • For each bill, we record the date and ticket corresponding to this bill, number of the total hours and the parts bought (if any), and the total cost of the bill. Draw an ER diagram that captures the preceding information. Identify any constraints not captured by the ER diagram.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Draw a ERD diagram
Transcribed Image Text:1. Create an ElRD for a car service facility. Base your design on the following business rules:
• When a customer takes one or more cars in for repair or service, one service ticket is written for each
car.
. The ticket contains the needed and recommended services for the car.
• A services book records the number of hours needed for each service based on the car model and
year.
•We maintain a service history for each of the cars serviced. The service records are referenced by the
cars serial number.
• A car brought in for service can be worked on by many mechanics, and each mechanic may work on
many cars. We need to record the hour each mechanic on each car.
• For each mechanics, we keep track of name, address, and the hourly wage
• A car that is serviced may or may not need parts (e.g., adjusting a carburetor or cleaning a fuel injector
nozzle does not require providing new parts).
• Parts can be bought by the customers and handed to the service facility, or the service facility can
obtain these parts purchased and added it to the bill.
For each bill, we record the date and ticket corresponding to this bill, number of the total hours and
the parts bought (if any), and the total cost of the bill.
Draw an ER diagram that captures the preceding information. Identify any constraints not captured by
the ER diagram.
00000
二
典
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