Which of the Following Is True About Identifiers of Entities

question 77

Multiple Choice

Which of the following is true about identifiers of entities?

• A) Identifiers must be unique.
• B) Identifiers are not normally used in a naming role.
• C) The value of an identifier may identify a set of entity instances.
• D) Identifiers may not be more than two attributes.
• E) An identifier in the E-R model is equivalent to a key in the relational model.

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Definitions:

Substance Use Disorders

A medical condition characterized by the harmful use of substances including drugs and alcohol, leading to significant impairment or distress.

Binge Drinking

The consumption of an excessive amount of alcohol in a short period of time, often leading to impaired judgment and increased risk of alcohol poisoning.

Heavy Drinking

The consumption of alcohol in a manner that exceeds moderate drinking guidelines and poses a risk to health and well-being.

Addiction Diagnosis

The clinical process of identifying and classifying an addiction based on established criteria, taking into account patterns of substance use or behavior.