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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 4, Problem 2RQ
Textbook Problem
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What is a strong (or identifying) relationship, and how is it depicted in a Crow’s Foot ERD?

Explanation of Solution

Strong relationship:

A strong relationship will occurs when an entity is existence-dependent on other entity and inherits more than one part of its Primary Key (PK) from that entity.

  • If an entity is referred as an “existence-dependent”, then that entity can exist in the database if and only if when it is related with another entity existence.
  • A strong relationship exists when a weak entity is associated to its parent entity...

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