Exam 8: Structuring System Data Requirements

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Specifications that preserve the integrity of the logical data model are:

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A ________ is an assertion or rule that governs the validity of data manipulation operations such as insert,update,and delete.

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A detailed,logical representation of the entities,associations,and data elements for an organization or business area defines:

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A ________ is a simultaneous relationship among instances of three entity types.

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Conceptual data modeling for an Internet-based electronic commerce application differs significantly from the process followed when analyzing the data needs for other types of applications.

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A set of two or more multivalued attributes that are logically related defines:

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A repeating group is a set of two or more multivalued attributes that are logically related.

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An ________ is a single occurrence of an entity type.

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A ________ is an attribute that may take on more than one value for each entity instance.

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A ternary relationship is a relationship between the instances of one entity type.

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An ellipse represents an entity on an entity-relationship diagram.

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Define domains for the following attributes: GPA,rank,and age.

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A true data entity will have many possible instances,each with a distinguishing characteristic,as well as one or more other descriptive pieces of data.

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The ________ specifies that if an entity instance of the supertype is a member of one subtype,it cannot simultaneously be a member of any other subtype.

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The most common format used for data modeling is:

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An ________ is a detailed,logical representation of the entities,associations,and data elements for an organization or business area.

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Which of the following refers to an assertion or rule that governs the validity of data manipulation operations such as insert,update,and delete?

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A plural relationship is a relationship that the data modeler chooses to model as entity type.

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The ________ specifies that an entity instance of the supertype is allowed not to belong to any subtype.

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A candidate key that has been selected as the unique,identifying characteristic for an entity type is called a(n):

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