Busn 286

Topics: Entity-relationship model, Want, Associative Entities Pages: 2 (784 words) Published: December 17, 2012
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?
Any amount.
* b. What is the degree of the Used_on relationship?
Binary, two degrees for the relationship.
* c. Do any associative entities appear in this diagram? If so, name them. Yes Task is an associative entity.
* d. How else could the attribute Skill be modeled?
It could be shown coming off of Task as another blue square attached back to Task * e. What attributes might be attached to the Works_on relationship? The different positions on the project. It could include the jobs and requirements as well. * f. Could TOOL be modeled as an associative entity? Why or why not? No because different tool can be used on different tasks. Sometimes you would need more or less tools depending on what you are trying to do. 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 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 systems at each store need to be linked so that sales and inventory levels can be determined instantly for each store and for both stores combined. The owner can allocate $40,000 for hardware and $20,000 for software and must have the new system operational in three months. Training must be short and easy. Briefly describe three alternative systems for this situation and explain how each would meet the requirements and constraints. Are the requirements and constraints realistic? Why or why not?

Alternative A. This would be the low cost method. This would be under the price limit and would be able to be completed well within the three month limit. Also, the...
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