Which of the Following Is Not True of MUST Constraint

question 90

Multiple Choice

Which of the following is not true of MUST constraint?

• A)It may be needed in ternary relationships to enforce special business rules.
• B)It can be expressed directly in a relational model.
• C)It must be enforced by program code.
• D)It requires that one entity be combined with another entity.

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Definitions:

Panic Disorder

A psychiatric condition marked by repeated episodes of intense fear or anxiety that appear suddenly and often unexpectedly.

Obsessive-compulsive Disorder

A mental disorder characterized by uncontrollable, reoccurring thoughts (obsessions) and behaviors (compulsions) an individual feels compelled to repeat.

Panic Disorder

A mental health condition characterized by sudden and recurrent panic attacks, often with no obvious trigger.

Agoraphobia

An anxiety disorder characterized by an intense fear of being in places where escape might be difficult or that help wouldn't be available if things go wrong.