Modality refers to:
A)Relationships of one-to-one;one-to-many;or many-to-many
B)Whether a child entity can exist with or without a related instance in the parent entity
C)The hierarchical structure that was developed in process models applied to data models
D)The number of attributes generated by an entity
E)Whether the entity has a unique identifier (aka 'primary key')or a concatenated identifier (aka 'composite key')

Question

Quizplus · Accepted Answer

Modality in database design refers to whether a child entity can exist without a related instance in the parent entity (known as optional modality) or must always have a related instance in the parent entity (known as mandatory modality). The other options listed do not accurately describe modality in database design.

Modality Refers To