Which of the Following Is Not True About Representing Subtypes

question 78

Multiple Choice

Which of the following is not true about representing subtypes in a relational database design?

• A)One table is created for the supertype and one for each subtype.
• B)All of the attributes of the supertype are added to the subtype relations.
• C)The key of the supertype is made the key of the subtypes.
• D)A subtype and its supertype are representations of the same underlying table.
• E)An instance of the supertype may be related to one instance each of several subtypes.

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Definitions:

Official Poverty

A governmentally determined poverty threshold that indicates the minimum level of income required to meet basic needs.

Intergenerational Mobility

The change in social status or class across generations within a family.

Standard of Living

A level of wealth, comfort, material goods, and necessities available to a certain socioeconomic class or geographic area.

Structural Mobility

The movement of individuals or groups within or between social strata in a society, typically driven by changes in the economy or societal structures rather than individual efforts.