Database Systems: Design, Implementation, Management, Loose-leaf Version
Database Systems: Design, Implementation, Management, Loose-leaf Version
12th Edition
ISBN: 9781305866799
Author: Coronel, Carlos; Morris, Steven
Publisher: Course Technology
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Chapter 2, Problem 3P
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Crow’s Foot notation:

In the Crow’s Foot model by the three-pronged crow’s foot to exhibit the “many” side relationship.

  • In this notation, “1”is represented as a short line segment.
  • “M” is represented as three-pronged crow’s foot.
  • The relationship name is represented above the relationship line.
  • Consider the following business rule referred in problem2 that describes the relationship between AGENT and CUSTOMER and it is written as follows.
    • One agent can have many customers, but each customer has only one agent.
    • From the above business rule, it is concluded that there exist a 1:M relationship between AGENT and CUSTOMER.
  • The Crow’s Foot ERD for the given business rule is depicted as follows.

Database Systems: Design, Implementation, Management, Loose-leaf Version, Chapter 2, Problem 3P

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