Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 18RQ
Program Plan Intro
Business rules:
Entity Relationship Diagram (ERD) is based on many business rules, which are written before the first entity box.
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Describe in your own words the purpose of the two business rules listed on page 140.
Write the business rules that are reflected in the ERD shown in Figure P2.15. (Note that the ERD reflects some simplifying assumptions. For example, each book is written by only one author. Also, remember that the ERD is always read from the “1” to the “M” side, regardless of the orientation of the ERD components.)
FIGURE P2.15 THE CROW’S FOOT ERD FOR PROBLEM 15
Please answer.
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- Explain four relationship merging issues.arrow_forwardCreate a Crow's Foot ERD to include the following business rules for the ProdCo company:a. Each sales representative writes many invoices.b. invoice is written by one sales representative.c. Each sales representative is assigned to one department.d. Each department has many sales representative.e. Each customer can generate many invoicesd. Each invoice is generated by one customerarrow_forwardEntity, relationship, and attribute names and definitions should all be correct.arrow_forward
- What are the key distinctions between overlapping and disjoint constraints, and how do you distinguish between the two?arrow_forwardCreate ERD using the following business rules. You can add Primary key and otherattributes that are related to.arrow_forwardThe following are the objectives for the design of the logical schema:arrow_forward
- All entity names, relationship names, and attribute definitions must be correct.arrow_forwardEach publisher has a unique name; a mailing address and telephone number are also kept on each publisher. A publisher publishes one or more books; a book is published by exactly one publisher. A book is identified by its ISBN, and other attributes are title, price, and number of pages. Each book is written by one or more authors; an author writes one or more books, potentially for different publishers. Each author is uniquely described by an author ID, and we know each author’s name and address. Each author is paid a certain royalty rate on each book he or she authors, which potentially varies for each book and for each author. An author receives a separate royalty check for each book he or she writes. Each check is identified by its check number, and we also keep track of the date and amount of each check. As you develop the ERD for this problem, follow good data naming guidelines.arrow_forwardDraw the Crow’s Foot ERD to reflect the dependency diagrams you drew in Part c. (Note: You might have to create additional attributes to define the proper PKs and FKs. Make sure that all of your attributes conform to the naming conventions.)arrow_forward
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