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 8C
Explanation of Solution
Crow’s Foot ER diagram for MARU art school:
The following data model shows the solution for the given question.
Explanation:
- In the above data model, “Student” entity contains “Stud_No” as primary key and details of the student are present in the “Student” entity.
- The “Instructors” is a subtype of “Student” entity. Here same “Stud_No” is the primary and foreign key. The “Student” supertype entity has optional “Instructors” entity.
- The many class is assigned to one instructor so one-to-many relationship is used...
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Salesperson(spID, spName, spBirthDate,spCitySelling, bonusPercent)
spID: Unique identification number of the salesperson.
spName: Full name of the salesperson.
spBirthDate: Birthdate of the salesperson.
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Access Assignment
Problem: JMS TechWizards is a local company that provides technical services to several small businesses in the area. The company currently keeps its technicians and clients’ records on papers. The manager requests you to create a database to store the technician and clients’ information.
The following table contains the clients’ information.
Client Number
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Street
City
State
Postal Code
Telephone Number
Billed
Paid
Technician Number
AM53
Ashton-Mills
216 Rivard
Anderson
TX
78077
512-555-4070
$315.50
$255.00
22
AR76
The Artshop
722 Fisher
Liberty Corner
TX
78080
254-555-0200
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23
BE29
Bert's Supply
5752 Maumee
Liberty Corner
TX
78080
254-555-2024
$229.50
$0.00
23
DE76
D & E Grocery
464 Linnell
Anderson
TX
78077
512-555-6050
$485.70…
Alternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users.
These indexes would be considered Alternate or Secondary keys and are mostly used for queries
and quick reporting. They may contain multiple columns.
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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