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Data Model Comparison Quiz

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Questions and Answers

What is the primary key?

Attribute property of an entity

Simple key

Candidate key (correct)

Foreign key

Which constraint requires that critical information isn't duplicated?

Primary key

Candidate key (correct)

Simple key

Foreign key

What is a composite key made up of?

All attributes with unique values

An attribute used to reference a primary key

Two or more attributes (correct)

Only one attribute

Which type of key is used to reference a primary key in another table?

Foreign key Signup and view all the answers

In the context of relational databases, what does 'degree' refer to?

The number of attributes in a relation Signup and view all the answers

What does 'cardinality' signify in relational databases?

The number of tuples in a relation Signup and view all the answers

What does the hierarchical data model prevent entities from doing?

Being related to any entity more than one level up the hierarchy Signup and view all the answers

In the network data model, what is a key feature regarding child entities?

They can have more than one parent Signup and view all the answers

How are entities described in data modeling?

Using a minimal set of attributes that uniquely identify them Signup and view all the answers

What do data model constraints primarily help to ensure?

Data accuracy Signup and view all the answers

Which type of relationship in data models describes an association among two entities?

One-to-one (1:1) Signup and view all the answers

Why are constraints considered important in database design?

To ensure data integrity and consistency Signup and view all the answers

Which type of attribute can be divided into further parts?

Composite attributes Signup and view all the answers

What does a multivalued attribute represent within the ERD symbols?

Attribute Signup and view all the answers

What is the main characteristic of a single-valued attribute?

Cannot be divided further Signup and view all the answers

In an Entity-Relationship Diagram (ERD), what do 'Null Values' represent?

Values that are not applicable or unknown Signup and view all the answers

Which symbol in an ERD represents a multivalued attribute?

( ) Signup and view all the answers

What defines the Degree of Relationship in an ERD?

Number of entities participating in the relationship Signup and view all the answers