1. (5 points) Use the contents of Figure 1 to work Problems 1-3.
a) Write the business rule(s) that governs the relationship between AGENT and CUSTOMER.
b) Given the business rule(s) you wrote in Problem 1, create the basic Crow’s Foot ERD.
c) Using the ERD you drew in Problem 2, create the equivalent Chen diagram.
2. (5 points) Using Figure 2 as your guide, work Problems 4–5. The relational diagram
shows the initial entities and attributes for the DealCo stores, located in two regions
of the country.
a) Identify each relationship type and write all of the business rules.
b) Create the basic Crow’s Foot ERD.
3. (5 points) Describe the relationships (identify the business rules) depicted in the
Crow’s Foot ERD shown in Figure 3.
4. (5 points) Create an ERD using the Chen Model to depict the relationships
described through a set of business rules below.
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One publisher can publish many books.
Each book is published by one publisher.
A publisher can submit many (book) contracts.
Each (book) contract is submitted by one publisher.
One author can sign many contracts.
Each contract is signed by one author.
One author can write many books.
Each book is written by one author.