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Introduction to Database System

Introduction to Database System
Entities can be associated with one another in which of the following?

Relationships
Entities
Identifiers
Attributes

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Introduction to Database System
A key is a group of one or more attributes that uniquely identifies a row.

False
True

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Introduction to Database System
When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):

transitive dependency.
normal form.
referential integrity constraint.
insertion anomaly.

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Introduction to Database System
A _____ means that one record in a particular record type may be related to more than one record of another record type.

One-to-one relationship
Many-to many relationship
Many-to-one relationship
One-to-many relationship

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Introduction to Database System
Which type of entity represents an actual occurrence of an associated generalized entity?

Archetype entity
Subtype entity
Supertype entity
Instance entity

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Introduction to Database System
Composite identifiers consist of two or more attributes.

False
True

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