Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 12RQ
Discuss two ways in which the 1:M relationship between COURSE and CLASS can be implemented. (Hint: Think about relationship strength.)
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E-R model is an acronym for this. Encircle the correct choice.
a. Entity reference model
b. Event reaction model
c. Entity-Relationship model
Show that you understand the Entity-Relationship Model and how it works.
Discuss the differences between a weak relationship and a strong relationship.
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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- Suppose you are working within the framework of the conceptual model in Figure Q4.5. FIGURE Q4.5 THE CONCEPTUAL MODEL FOR QUESTION 5arrow_forwardWrite down the various types of characteristics in the Entity-Relationship (ER) model.arrow_forwardExplain what it is that the Entity-Relationship model does.arrow_forward
- When evaluating the correctness of a model, the only thing that can be considered is how well the model performs on test data. explain in detail, expand on? Explain?arrow_forwardDraw 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_forwardWhat is weak entity type? The formula? For instance. Alternative specialisation?What does the ER graphic depict? Example, diagram.arrow_forward
- Study the details below and create ERD diagram for each question below. Drone / Video: a Drone may take many Videos; a Video is taken by one Drone. A Video instance is optional for a Drone; a Drone instance is required for a Video. A Facility may be recorded by many Videos; a Video records one Facility. A Video instance is optional for a Facility; a Facility instance is required for a Video. A Video may be the basis of many Analyses; an Analysis is based on one Video. An Analysis instance is optional for a Video; a Video instance is required for an Analysisarrow_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_forwardWhat does it mean when you say that an analysis is based on an assumptionarrow_forward
- Making use of the accompanying guidelines, jot down some notes on how to construct a model in Plaxis.arrow_forwardUsing a diagram, explain the prototype model. What are the benefits, drawbacks, and applications of this model?arrow_forwardWhat 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_forward
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