What is the purpose of an ERD's cardinality constraints?

To define the relationships between entities in a database model.

To determine the data types of attributes in a database model.

To specify the primary keys of entities in a database model.

To define the order of records in a database model.

Which of the following is true regarding a composite attribute in an ERD?

A composite attribute can be divided into smaller sub-parts.

A composite attribute cannot have sub-parts.

A composite attribute is always a single value.

A composite attribute cannot be represented in an ERD.

In an ERD, what does the term "superkey" refer to?

An attribute that uniquely identifies an entity within an entity set.

A key that is used for indexing purposes only.

A key that is not a candidate key

A set of attributes that represent a foreign key in a relation.

What is an entity set in an entity-relationship diagram (ERD)?

A collection of similar entities with common attributes.

A group of unrelated entities with different attributes.

A single entity with unique attributes.

A relationship between two entities.

Which of the following best describes the cardinality of an entity set in an ERD?

The number of entities in the set

It defines the data type of the attributes in the entity set

It represents the primary key of the entity set

It specifies the total number of attributes in the entity set

What is the primary purpose of an entity set in an ERD?

To represent a collection of similar entities in the database schema

To represent a single entity in the database schema

To store metadata about the database schema

To define relationships between entities

How are entities related within an entity set in an ERD?

Entities within an entity set in an ERD are related through relationships.

Entities within an entity set in an ERD are related through functions.

Entities within an entity set in an ERD are related through classes.

Entities within an entity set in an ERD are related through attributes.

What does the term "entity type" refer to in the context of an entity set?

Category or classification of entities within an entity set

Order of the entities in the entity set

Size of the entities in the entity set

Color of the entities in the entity set

Which of the following statements about entity sets is true?

Entity sets are collections of similar entities, and each entity set corresponds to a table in a relational database.

Entity sets can only contain entities of the same type

Each entity set corresponds to a column in a relational database

Entity sets are used to store non-related entities in a database

What is an attribute in an entity-relationship diagram (ERD)?

An attribute in an entity-relationship diagram (ERD) represents a property or characteristic of an entity.

An attribute in an ERD is a primary key

An attribute in an ERD is a relationship between entities

An attribute in an ERD is a data type

What does a derived attribute in an ERD represent?

An attribute whose value can be derived from other attributes in the database.

An attribute that is mandatory for all entities

An attribute that is not related to any other attribute

An attribute that cannot be modified

What is the purpose of an attribute type in an ERD?

To define the kind of data that can be stored in a specific attribute of an entity.

To determine the primary key of the entity

To specify the relationship between entities

To define the color scheme of the ERD diagram

What does a key attribute represent in an ERD?

A key attribute in an ERD represents a unique identifier for each entity instance.

A key attribute in an ERD represents a random value for each entity instance.

A key attribute in an ERD represents a non-unique identifier for each entity instance.

A key attribute in an ERD represents the most common value for each entity instance.

What does the term "composite attribute" refer to in an ERD?

A composite attribute in an ERD refers to an attribute that can be divided into smaller sub-parts, each representing a separate attribute within the entity.

A composite attribute in an ERD refers to an attribute that is a primary key for each entity

A composite attribute in an ERD refers to an attribute that is optional for each entity

A composite attribute in an ERD refers to an attribute that is unique to each entity

In an ERD, what does a multivalued attribute represent?

It represents an attribute that can have multiple values for a single entity instance.

It represents an attribute that can have only one value for a single entity instance.

It represents an attribute that is mandatory for all entity instances.

It represents an attribute that is used for identifying unique entity instances.

What is the purpose of a primary key in an entity-relationship diagram (ERD)?

To uniquely identify each record in the entity and establish relationships between entities.

What does the term "superkey" refer to in an ERD?

A set of attributes that uniquely identifies each tuple in a relation.

A set of attributes that uniquely identifies each column in a table.

A key that is not unique in a relation.

A key that is used for sorting data in a relation.

What does the term "candidate key" signify in an ERD?

A key that is one of the possible choices for the primary key

Index used for faster data retrieval

What does cardinality in an entity-relationship diagram (ERD) specify?

It specifies the degree of participation of an entity in a relationship

It specifies the color of entities in the diagram

It specifies the size of entities in the diagram

It specifies the font style of entities in the diagram

In an ERD, what does the cardinality (0, M) represent?

One entity can be associated with zero or multiple instances of another entity.

One entity can be associated with zero instances of another entity.

One entity can be associated with multiple instances of another entity.

One entity can be associated with exactly one instance of another entity.

Entity Relationship Model

Authored by Michael Atienza

Computers

9th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an Entity Relationship Diagram?

An Entity Relationship Diagram is a relationship between properties of entities in a database.

An Entity Relationship Diagram is a type database table connections.

An Entity Relationship Diagram is a type of database programming.

An Entity Relationship Diagram (ERD) is a visual representation of the relationships between entities in a database.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is represented by a rectangle in an entity-relationship diagram?

Entity

Database

Attribute

Relationship

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an ERD, what does a diamond-shaped symbol represent?

Relationship

Cardinality

Entity

Attribute

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is not a cardinality constraint used in ER diagrams?

One-to-One

Many-to-Many

One-to-Many

All-to-All

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the crow's foot notation in an ERD signify?

Many relationship

Foreign key

Primary key

One-to-one relationship

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the line connecting two entities in an ERD represent?

Link

Relationship

Association

Connection

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an ERD, what does a double rectangle represent?

Primary key

Foreign key

Weak entity

Attribute

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Entity Relationship Model

What is an Entity Relationship Diagram?

What is represented by a rectangle in an entity-relationship diagram?

In an ERD, what does a diamond-shaped symbol represent?

Which of the following is not a cardinality constraint used in ER diagrams?

What does the crow's foot notation in an ERD signify?

What does the line connecting two entities in an ERD represent?

In an ERD, what does a double rectangle represent?

What is the purpose of an ERD's cardinality constraints?

Which of the following is true regarding a composite attribute in an ERD?

In an ERD, what is the cardinality notation for a One-to-Many relationship?

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