Chapter5- Data Modelling and Design (Hard)

Which category refers to the time interval of interest to the enterprise?

Where
Person or organization
What
When (correct)

Which category refers to the location of interest to the enterprise?

What
Person or organization
When
Where (correct)

What is the term used to represent an occurrence or value of a particular entity?

Entity Type
Entity
Entity Instance (correct)
Entity Alias

In data models, how are entities typically depicted?

Rectangles (A) Signup and view all the answers

Which term is often used in relational schemes to refer to a relationship?

Association (B) Signup and view all the answers

What is the purpose of cardinality in a relationship?

To specify the number of entities participating in the relationship (B) Signup and view all the answers

What is the arity of a relationship?

The number of entities involved in the relationship (D) Signup and view all the answers

In relational modeling, where are child entities typically placed in a recursive relationship?

On the many side of the relationship (A) Signup and view all the answers

Which of the following is NOT one of the six most commonly used data modeling schemes?

Structured (B) Signup and view all the answers

What are the three levels of detail at which data models exist?

Conceptual, Logical, Physical (B) Signup and view all the answers

What is the goal of data modeling and design?

To create a foundation for data governance programs (C) Signup and view all the answers

What are some examples of components in a data model?

Entities, Relationships, Facts, Attributes (A) Signup and view all the answers

Which one of the following is NOT one of the four main types of data that can be modeled?

Detail transaction information (B) Signup and view all the answers

What is the main purpose of data modeling?

To understand organizational data (D) Signup and view all the answers

What are the basic building blocks of most data models?

Entities, relationships, attributes, and domains (A) Signup and view all the answers

What is the definition of an entity in data modeling?

A thing about which an organization collects information (B) Signup and view all the answers

Which of the following is an example of a binary relationship in a data model?

Figure 34 (C) Signup and view all the answers

In a data model, what is a foreign key used for?

To represent a relationship between two entities (B) Signup and view all the answers

What is the difference between a simple key and a surrogate key?

A simple key is visible to end users, while a surrogate key is not (C) Signup and view all the answers

Which of the following is an example of a compound key in a data model?

Universal Product Code (UPC) (B) Signup and view all the answers

Which of the following is NOT a goal of data modeling?

To provide the starting point for customization, integration, or replacement of an application (D) Signup and view all the answers

What is the purpose of data models in data management?

To provide a common vocabulary around data (B) Signup and view all the answers

What does a data model help explain?

All of the above (D) Signup and view all the answers

What is the role of a data model in data understanding?

All of the above (D) Signup and view all the answers

Which of the following is an example of a candidate key for a customer entity?

Email address (D) Signup and view all the answers

What is the difference between a super key and a candidate key?

A super key is any set of attributes that uniquely identify an entity instance, while a candidate key is a minimal set of one or more attributes that identifies the entity instance to which it belongs. (B) Signup and view all the answers

What is a primary key?

A surrogate key that uniquely identifies an entity instance. (D) Signup and view all the answers

What is an alternate key?

A candidate key that was not chosen as the unique identifier for an entity. (B) Signup and view all the answers

What is the difference between a business key and a surrogate key?

A business key is one or more attributes that a business professional would use to retrieve a single entity instance, while a surrogate key is a candidate key that is chosen to be the unique identifier for an entity. (B) Signup and view all the answers