Subtypes Should Be Used When

question 61

Multiple Choice

Subtypes should be used when:

• A) there are attributes that apply to some but not all instances of an entity type.
• B) supertypes relate to objects outside the business.
• C) the instances of a subtype do not participate in a relationship that is unique to that subtype.
• D) a recursive relationship is needed.

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Definitions:

Organ of Corti

A structure located on the basilar membrane in the cochlea of the inner ear, responsible for detecting sound vibrations.

Cochlea

The inner ear; the bony tube that contains the basilar membrane and the organ of Corti.

Milligram

A unit of mass equal to one thousandth of a gram, often used to measure medication or chemical substances.

Desensitized

A reduction in emotional responsiveness to a stimulus after repeated exposure to it, often leading to a decrease in intense emotional reactions.