Week 4-Problems and Exercises_CH

# Week 4-Problems and Exercises_CH

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Week 4: Problems and Exercises 5. Consider the E-R diagram in Figure 7-20 . Based on this E-R diagram, answer the following questions: a. How many EMPLOYEES can work on a project? Based on the below diagram it shows many to many which means that several employee can work on several projects b. What is the degree of the Used_on relationship? The zero through the line means a minimum cardinality of zero, whereas the crow’s-foot notation means a “many” maximum cardinality (Hoffer 204) Jeff A. Essentials of Systems Analysis and Design, VitalSource eBook for DeVry University. Pearson Learning Solutions, 02/2012. VitalBook file. c. Do any associative entities appear in this diagram? If so, name them . The Work_on is the only associate entity d. How else could the attribute Skill be modeled? It could be modeled as part of the Work on entity. e. What attributes might be attached to the Works_on relationship? None can be assigned to the Work_on because it is not an entity.

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• Spring '11
• New
• Entity-relationship model, Pearson Learning Solutions, Associative Entities, Jeff A. Essentials, University. Pearson Learning

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