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Introduction to Database System

Introduction to Database System
Relations are categorized into normal forms according to the referential integrity constraints that they have.

True
False

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Introduction to Database System
Which of the following indicates the minimum number of entities that must be involved in a relationship?

ERD
Minimum cardinality
Greater Entity Count (GEC)
Maximum cardinality

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Introduction to Database System
A subtype entity is a special case of another entity called a supertype entity.

False
True

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Introduction to Database System
Queries to a database

are written in English
both (a) and (b)
can use aggregate functions like SUM and COUNT
All of these
None of these

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Introduction to Database System
A ternary relationship is so called because in contains two entities and one association between them.

False
True

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Introduction to Database System
Which of the following is a group of one or more attributes that uniquely identifies a row?

Determinant
Relation
Key
Tuple

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