When Selecting an Identifier,one Should

question 47

Multiple Choice

When selecting an identifier,one should:

• A)use intelligent keys
• B)use large composite keys instead of single-attribute surrogate keys
• C)choose a candidate key that will not change its value over the life of each instance of the entity type
• D)choose a candidate key such that for each instance of the entity,the attribute is guaranteed to have valid values or is null

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Definitions:

Relaxed Attitude

A state of being free from tension and anxiety.

Physical Activities

Any form of movement that requires energy expenditure and is carried out by the muscles of the body, including sports, exercise, and daily tasks.

Type A Personality

A behavior pattern characterized by high levels of competitiveness, urgency, aggressiveness, and impatience, often associated with a higher risk of coronary heart disease.

Competitive

Relating to or characterized by competition; involving entities striving against one another to attain a goal or superiority in a given field or activity.