A Binary One-To-Many Relationship in an E-R Diagram Is Best

question 305

Multiple Choice

A binary one-to-many relationship in an E-R diagram is best represented by:

• A) the creation of a separate relation; the primary key of this new relation is a composite key consisting of the primary key for each of the two entities in the relationship.
• B) adding the primary key attribute (or attributes) of the entity on the one side of the relationship as a foreign key in the relation that is on the many side of the relationship.
• C) adding the primary key attribute (or attributes) of the entity on the many side of the relationship as a foreign key in the relation that is on the one side of the relationship.
• D) creating a relation with a composite primary key and nonkey attributes.
• E) none of the above.

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Definitions:

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