single instance of the entity?  There must be a maximum of one attribute instance. There must be many instances of the attribute. There must be at most one entity instance that each attribute instance describes. There must be at least one instance of the attribute. There must be zero or more instances of the attribute.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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In order to be used as a primary key, which of these characteristics must an attribute possess with respect to a single instance of the entity? 

There must be a maximum of one attribute instance.

There must be many instances of the attribute.

There must be at most one entity instance that each attribute instance describes.

There must be at least one instance of the attribute.

There must be zero or more instances of the attribute.

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Below are the correct options: 

There must be a maximum of one attribute instance.

There must be at most one entity instance that each attribute instance describes.

 

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