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Problems and Exercise Questions for Week 4

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Problems and Exercise Questions for Week 4

1. Chapter 7, Problems/Exercises, Questions 5, 16, and 17 (post in the “Week4: Problems and Exercise” DropBox).
5. Study the E-R diagram of Figure 7–20. Based on this E-R diagram, answer the following questions: (5 points) a. How many PROJECTs can an employee work on?
As we see the sign for mandatory many there are 2 entity with 2 entity type b. What is the degree of the includes relationship? Between Tool and Task we got Binary Relationship Many to many if say” tools”, otherwise it will be one to many. c. Are there any associative entities on this diagram? If so, name them.
No. between tools and city we do not need to have any associative entities.
An associative entity is a relationship that the data modeler chooses to model as an entity type

d. How else could the attribute Skill be modeled?
We can use a multivalued attribute may take on more than one value for each entity
Project _ID-Employee_ID Task_ID all in one box

e. Is it possible to attach any attributes to the Includes relationship?
Tasks require Time and Skill, and have to be done in the city by an employee who has an ID and carries tools.
f. Could TASK be modeled as an associative entity?
Yes it can as our book explain: An entity type that associates the instances of one or more entity types and contains attributes that are peculiar to the relationship between those entity instances.

16. The owner of two pizza parlors located in adjacent towns wants to computerize and integrate sales transactions and inventory management within and between both stores. The point-of-sale component must be very easy to use and flexible enough to accommodate a variety of pricing strategies and coupons. The inventory management, which will be linked to the point-of-sale component, must also be easy to use and fast. The

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