a. What is an Entity? How is an Entity described in an ERD?
b. What is cardinality? What does cardinality (0,N) mean?
c. What is a weak relationship? How is it identified in an ERD? Give an example.
d. What is a strong relationship? How is it identified in an ERD? Give an example.
e. Discuss the difference between a composite key and a composite attribute. How would each be indicated in an ERD? Give an example.
f. What two courses of action are available to a designer when encountering a multivalued attribute?
g. What is a derived attribute? Give an example.
For the following questions, use Microsoft Visio, or a free alternative such as Lucidchart (Lucidchart.com) to create an ERD:
h. How is a relationship between entities indicated in an ERD? Give an example, using the Crow’s Foot notation.
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