An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A. What is the cardinality ratio? a. one to many b. many to one c. one to one d. many to many

An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A. What is the cardinality ratio? a. one to many b. many to one c. one to one d. many to many

Principles of Information Systems (MindTap Course List)

12th Edition

ISBN:9781285867168

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter5: Database Systems And Applications

Section: Chapter Questions

Problem 4PSE: Using a graphics program, develop an entity-relationship diagram for a database application for an...

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A. What is the cardinality ratio?

a. one to many

b. many to one

c. one to one

d. many to many

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