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Introduction to Database System

Introduction to Database System
Which of the following is NOT a basic element of all versions of the E-R model?

Attributes
Relationships
Entities
Primary keys

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Introduction to Database System
A functional dependency is a relationship between or among:

rows.
attributes.
tables.
relations.

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Introduction to Database System
Entity instances are associated by relationship classes.

False
True

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Introduction to Database System
An identifier determines the type of relationship that an entity has.

True
False

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

Instance entity
Archetype entity
Subtype entity
Supertype entity

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Introduction to Database System
A file that is organized in uniform format is formally referred to as a _____ or a database file.

Structured data file
Document
Database
None of these
Record

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