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Southern New Hampshire University *

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Course

220

Subject

Computer Science

Date

Apr 3, 2024

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1

Uploaded by DrClover14029

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Question 1 2 / 2 points To be used as a primary key, which of these characteristics must an attribute have in a single instance of the entity? Select all that apply. | 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. 21 There must be at least one instance of the attribute. | There must be zero or more instances of the attribute. W Hide question 1 feedback During the extraction of data from a database, a primary key must be singular, regular, and unique. For a single entity instance, consider the following definitions: An attribute is termed singular when a maximum of one data value may exist. An attribute is unique when the data value occurs only once. An attribute is considered required when at least one data value must exist. Question 2 2 / 2 points A singular attribute is also known as a unique attribute. True o) False
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