Certified Data Management Professional CDMP Associate · Free Practice Question Medium
Question 1
In entity-relationship modeling, what does a one-to-many relationship indicate?
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A
Each instance of entity A can be related to multiple instances of entity B, but each instance of entity B is related to only one instance of entity A
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B
Each instance of entity A must be related to exactly one instance of entity B
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C
Each instance of entity A can be related to a maximum of one instance of entity B
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D
Entities A and B have no relationship
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E
Entity B is a subtype of entity A
Reveal correct answer
Correct answer: A
Explanation
In a one-to-many relationship, one entity (the "one" side) can be associated with multiple instances of the related entity (the "many" side), but each instance on the "many" side is associated with only one instance on the "one" side. An example would be a department having many employees.
Discussion
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