For a Unary M:N Relationship

question 105

Multiple Choice

For a unary M:N relationship:

• A) the entity type is modeled as one relation; a separate relation is created to represent the M:N relationship; the new relation has a composite key that consists of two attributes that both take their values from the same primary key.
• B) the entity type and the M:N relationship are modeled as one relation; a composite key consisting of two attributes that both take their values from the same primary key is used as the primary key for the relation.
• C) separate relations for the class and for each subclass are created; primary and foreign keys are established for each class.
• D) the primary key of the entity on the one side of the relationship serves as a foreign key in the relation on the many side of the relationship.
• E) none of the above is true.

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Definitions:

Interest

Interest is the cost of borrowing money, typically expressed as a percentage of the principal, or the income earned on deposited funds.

Study

An investigation or analysis of a subject or area of research to acquire knowledge or establish facts.

Descriptive Statistics

The discipline of quantitatively describing the main features of a collection of data.

Statistical Inference

The process of deriving conclusions about a population based on information obtained from a sample of that population.