Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 5RQ
Suppose you are working within the framework of the conceptual model in Figure Q4.5.
FIGURE Q4.5 THE CONCEPTUAL MODEL FOR QUESTION 5
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QUESTION : YOU ARE GIVEN AN ER DIAGRAM . YOU HAVE TO CONVERT IT INTO RATIONAL MODEL.
We are going to go over some of the essential characteristics and features of descriptive models in the following paragraphs.
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Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- Explain prototype model with diagram. What are the advantages, disadvantages and use of this model.arrow_forwardWe will cover the key aspects and properties of descriptive models.arrow_forwardIn the following paragraphs, I will go through the characteristics and qualities that descriptive models often have.arrow_forward
- In this section, we will discuss the fundamental characteristics and attributes of descriptive models.arrow_forwardDraw an EER diagram for the following problem using this text’s EER notation, the Visio notation, or the subtypes inside supertypes notation, as specified by your instructor. A nonprofit organization depends on a number of different types of persons for its successful operation. Theorganization is interested in the following attributes for all of these persons: SSN, Name, Address, City/State/Zip, and Telephone. Three types of persons are of greatest interest: employees, volunteers, and donors.Employees have only a Date Hired attribute, and volunteershave only a Skill attribute. Donors have only arelationship (named Donates) with an Item entity type.A donor must have donated one or more items, and anitem may have no donors, or one or more donors.There are persons other than employees, volunteers,and donors who are of interest to the organization so thata person need not belong to any of these three groups. Onthe other hand, at a given time a person may belong totwo or more of these…arrow_forwardDraw an EER diagram for the following problem using this text's EER notation, the Visio notation, or the subtypes inside supertypes notation, as specified by your instructor. A nonprofit organization depends on a number of different types of persons for its successful operation. The organization is interested in the following attributes for all of these persons: SSN, Name, Address, City /State/Zip, and Telephone. Three types of persons are of greatest interest: employees, volunteers, and donors. Employees have only a Date Hired attribute, and volunteers have only a Skill attribute. Donors have only a relationship (named Donates) with an Iten1 entity type. A donor must have donated one or more items, and an item may have no donors or one or more donors. There are persons other than employees, volunteers, and donors who are of interest to the organization so that a person need not belong to any of these three groups. On the other hand, at a given time a person may belong to two or more…arrow_forward
- We will go through many key characteristics and behaviors for descriptive models in more detail below.arrow_forwardWhich descriptive model characteristics are most important?arrow_forwardConsider a model of an airport with planes, models of planes, a test of planes, and technicians. Draw an ER diagram to represent these entities and the following attributes.Planes have a unique registration number. Airplane Models are each identified by a model number (e.g. DC-80), and each has a capacity and a weight. A number of technicians work at the airport. You need to store for each the name, phone number, address, and salary. The airport has a number of tests that are used regularly to ensure that airplanes aresafe. Each test has a unique FAA number, a name, and a maximum possible score.Extend your ER diagram with relationships to represent the following information.(a) Each airplane is of one specific model.(b) Each technician is an expert on one or more plane models. His or her expertise may overlap with that of other technicians. (c) Transport Canada requires the airport to keep track of each time a given airplane is tested using a given test. For each testing event, the…arrow_forward
- Draw an Entity Relationship diagram for modeling the following system. Use relational modelling techniques in your design. You are free to make reasonable assumptions for your model unless they conflict with the definition below. Also explain your design with a paragraph. [Caution: Create your solution using paper and pen. Then put the image of your solution here. Drawing/writing with computer tools will not be accepted. Also include your name and signature in the solution paper]Problem definition: “There is a need to keep track of data for a hospital. The hospital building consists of several departments. Each department is identified with its name. For each department, the following data should also be stored: the number of floors, opening hour, and closing hour. Each department has a number of rooms. Each room is identified by its room number, but there might be rooms with the same name in different departments. At each department, many doctors and nurses can work.A doctor is…arrow_forwardWith neat diagram, explain the iterative process of calibrating a model.arrow_forwardCreate a conceptual model In your conceptual diagram, you need to show all the relationships and data types apply (include all the entities from the case study above)arrow_forward
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