Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 5, Problem 7P
Explanation of Solution
Crow’s Foot ER diagram for FlyRight Aircraft Maintenance division of the FlyRight Company:
The following data model shows the solution for the given question.
Explanation:
- In the above data model, the disjoint constraint (d) is used as a category symbol. Here the “Employee” supertype entity has optional subtypes. The primary of “Employee” entity is “Emp_No”...
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Students have asked these similar questions
Instructions: Create a dimensional model for a particular business process involving
gym membership. A customer can sign up for a membership of say one, three, six or
twelve months. I want to make it easy to query to identify current members, members
who expired in the last month, members who renewed in the last month, those who are
pending expiry etc.
If I have a basic model with a fact table representing a gym membership say
start_date_key
end_date_key
membership_attribute_key
customer_atrribute_key
fee
with associated dimension table for date, membership attributes such as length,
customer attributes and so forth. On a particular day, the active members are those with
a start date before the day and an end date after that day. Those who will expire next
month are those where the end date is in a particular date range.
The FlyRight Aircraft Maintenance (FRAM) division of the FlyRight Company (FRC) performs all maintenance for FRC's aircraft. Produce a data model segment that reflects the following business rules:
All mechanics are FRC employees. Not all employees are mechanics.
Some mechanics are specialized in engine (EN) maintenance. Others are specialized in airframe (AF) maintenance or avionics (AV) maintenance. (Avionics are the electronic components of an aircraft that are used in communication and navigation.) All mechanics take periodic refresher courses to stay current in their areas of expertise. FRC tracks all courses taken by each mechanic—date, course type, certification (Y/N), and performance.
FRC keeps an employment history of all mechanics. The history includes the date hired, date promoted, and date terminated. Given those requirements, create the Crow's Foot ERD segment.
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A college course may have one or more scheduled sections or may not have a scheduled section. Attributes of COURSE include Course ID, Course Name, and Units. Attributes of SECTION include Section Number and Semester ID. Semester ID is composed of two parts: Semester and Year. Section Number is an integer (such as 1 or 2) that distinguishes one section from another for the same course but does not uniquely identify a section. How did you model SECTION? Why did you choose this way versus alternative ways to model SECTION?
Chapter 5 Solutions
Database Systems: Design, Implementation, & Management
Ch. 5 - Prob. 1RQCh. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQCh. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQCh. 5 - What is the difference between partial...Ch. 5 - Prob. 7RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 16RQCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8CCh. 5 - Prob. 9CCh. 5 - Prob. 10C
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