Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 5, Problem 1RQ
Explanation of Solution
Entity Supertype:
- The entity supertype is an entity type that has the relation with one or more subtypes and it contains the common attributes of its subtypes.
- The entity subtype is a grouping of entities type in single entity that shares the common attributes or relationships which are different from other grouping.
Use of entity supertype:
The reason for using entity supertype is to reduce redundant relationships and also reduce the number of nulls.
Example:
The following example demonstrates the “supertype” entity, “subtype” entity, and “discriminator”.
Explanation:
- Here, “Employee” entity is a “supertype” entity.
- “Hourly Employee”, “Salaried Employee”, and “Consultant” are the “Sub type” entities.
- “Emp_type” is a discriminator to select appropriate “subtype”.
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Chapter 5 Solutions
Database Systems: Design, Implementation, & Management
Ch. 5 - Prob. 1RQCh. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQCh. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQCh. 5 - What is the difference between partial...Ch. 5 - Prob. 7RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 16RQCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8CCh. 5 - Prob. 9CCh. 5 - Prob. 10C
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