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Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900

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BuyFindarrow_forward

Database Systems: Design, Implemen...

13th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781337627900
Chapter 5, Problem 2RQ
Textbook Problem
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What kinds of data would you store in an entity subtype?

Explanation of Solution

Entity Subtype:

  • Entity subtype is one type of entity which inherits the attributes from other entity.
  • The subtype relationship is a grouping of entities type in single entity that shares the common attributes or relationships which are different from other grouping.
  • It is related to an entity supertype, where the supertype entity has common characteristics and the subtype entity has the unique characteristics of each entity subtype.

Kind of data stored in entity subtype:

The entity subtype will store the data that is specific to the entity which means attributes that are unique the subtype.

Example:

The following example demonstrates the “supertype” entity, “subtype” entity, and “discriminator”...

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