Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 5, Problem 5.28RQ
Explanation of Solution
Supertype entity:
- In DBMS (
Database Management System), the supertype is the one of the entity type and it has a relationship with one or more subtypes. - The supertype contains attributes that are common to its subtypes.
Subtype entity:
- Subtype contains unique attributes, but it is different from each subtype.
- The subtype entities are subgroups of the supertype entity.
Example:
Consider an example of supertype and subtype of entities is as follows:
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What is an exclusive subtype relationship? Give an example other than one shown in this book. Draw an IE Crow’s Foot E-R diagram for your example
Give an example of a supertype–subtype relationship, other than one shown in this text. Illustrate your answer using an IE Crow’s Foot E-R diagram
Give an example of each of the following: a. a supertype/subtype relationship where the disjoint rule applies b. a supertype/ subtype relationship where the overlap rule applies
Chapter 5 Solutions
Database Concepts (7th Edition)
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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- Discuss the categorization of traceability relations; elicit a short example that describes the classification context; and, if required, construct a diagram.arrow_forwardWhat is an overlapping subtype? Give an examplearrow_forwardDiscuss how traceability relations are classified, elicit a brief example that defines the classification context, and draw a diagram if necessary.arrow_forward
- What is an example of a supertype/subtype connection in which the disjoint rule is applicable?arrow_forwardDiscuss the classification of traceability relations elicit brief an example that defines the classification context and draw a diagram if necessary.arrow_forwardWhat is a case where the disjoint rule is applied to a supertype/subtype connection? What use does a subtype discriminator serve?arrow_forward
- Relationship between supertypes and subtypes. Where does the rule of disjunction apply?arrow_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_forwardCan you define the weak entity type for me? Is there a secret to it? Provide an instance Just what does it mean to specialize in attribute?Where does ia fit into an ER diagram? Provide Illustration or Diagramarrow_forward
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