Bundle: Database Systems Design, Implementation, & Management, Loose-leaf Version, 13th + MindTapV2.0, 1 term Printed Access Card
13th Edition
ISBN: 9780357475188
Author: Coronel, Carlos, Morris, Steven
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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Chapter 4 Solutions
Bundle: Database Systems Design, Implementation, & Management, Loose-leaf Version, 13th + MindTapV2.0, 1 term Printed Access Card
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 - What is a derived attribute? Give an example. What...Ch. 4 - Prob. 11RQ
Ch. 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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- Consider 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_forwardWhich descriptive model characteristics are most important?arrow_forwardDraw 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_forward
- draw the er diagram and labelarrow_forwardWhat does the weak entity type actually mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.arrow_forwardData modeling is most often accomplished through the use of a(n) __________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagramarrow_forward
- What does the weak entity type really mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.arrow_forwardWhat components go into constructing a descriptive model?arrow_forwardQuestion 1 (a): Explain, Why do designer should do care about mental model/conceptual model idea?arrow_forward
- Draw an ERD for each of the following situations. (If you believe that you need to make additional assumptions, clearly state them for each situation.) Use MS Visio to draw the models. 2. A laboratory has several chemists who work on one or more projects. Chemists also may use certain chemicals on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of CHEMICAL include Compound No and Cost. The organization wishes to record Volume Used—that is, the amount of a given chemical used by a particular chemist working on a specified project. A chemist must be assigned to at least one project and one chemical on each project to which he or she is assigned. A given chemical need not be assigned to any project, and a given project need not be assigned to either a chemist or a chemical. Provide good definitions for all of the relationships in this situation. Please give proper…arrow_forwardDiscuss how data flow diagram and use case diagram are similar and how they are different. Support your answer with at least two examples for eacharrow_forwardI have a HW that is asking me to draw on ERD diagram for a simple purchasing system that has order with order id, customer id, and date; order consists of one or more items; items consist of item id, description and price, and customers list customer id, name, and address. Can you help?arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY