Database Modeling: Objects and Attributes Quiz

AdvancedVitality avatar
AdvancedVitality
·

Start Quiz

Study Flashcards

21 Questions

What is a characteristic of a strong entity?

Has its own unique identifier

How is a weak entity different from a strong entity?

Dependent on a strong entity

What does a double underline in an entity box signify?

Partial identifier

In the context of identifying relationships, what do they link together?

Strong entities to weak entities

When should a relationship with attributes become an associative entity?

When it links two strong entities together

What is an entity in the context of a database?

An object that will be composed of multiple attributes

Which of the following is a characteristic of identifiers (keys) in a database?

Will uniquely identify individual instances of an entity type

What does a composite attribute refer to in a database?

An attribute broken into component parts

In the context of attributes, what does 'single-valued' imply?

An attribute has a single, unique value for each entity

What is the purpose of an identifier (key) in a database?

To uniquely identify individual instances of an entity type

How are identifiers (keys) differentiated from other attributes in a database?

They uniquely identify individual instances of an entity type

What describes features pertaining to the association between entities in a relationship?

Relationship types

In the E-R model, what is the degree of a relationship?

The number of entity types participating in the relationship

What type of relationship involves three different entity types related to each other?

Ternary Relationship

What does 'One-to-Many' cardinality mean in a relationship?

An entity can have many related entities on one side

What defines the minimum number of instances one entity can be associated with another in an E-R diagram?

Cardinality Constraints

In an E-R model, what is an instance between specific entity instances?

Relationship instance

Which type of constraint specifies the maximum number of instances one entity can be associated with another in a relationship?

Cardinality Constraints

What does a Unary Relationship involve in the E-R model?

One entity related to another of the same entity type

What is represented by Multiple Relationships in an E-R diagram?

Entities related to each other in more than one way

How is 'Many-to-Many' cardinality defined in a relationship?

An entity can have many related entities on both sides

Test your understanding of objects in database modeling, focusing on instances in the database and attributes. Identify what should and should not be considered as entities in database modeling.

Make Your Own Quizzes and Flashcards

Convert your notes into interactive study material.

Get started for free

More Quizzes Like This

Database Modeling with ER Model
5 questions
Database Modeling with ER Model
5 questions
Entity Modeling Basics Quiz
10 questions
Use Quizgecko on...
Browser
Browser