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Database Design: Entity-Relationship Model (ER Model)

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Database Design: Entity-Relationship Model (ER Model)

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Questions and Answers

In the database design process, which stage involves understanding the information requirements and the constraints to be applied to the data?

Requirement analysis (correct)
Physical database design
Schema refinement
Logical database design

What is a superkey in the context of database design?

A set of attributes that does not uniquely identify an entity
A minimal set of attributes whose values uniquely identify an entity
A non-minimal set of attributes that can uniquely identify an entity
Any set of attributes that can uniquely identify an entity (correct)

What is a key also known as in the context of database design?

Candidate key (correct)
Foreign key
Superkey
Primary key

What is an Entity-Relationship (ER) diagram used for in database design?

Graphically presenting the E-R model (B) Signup and view all the answers

What should the selection of a key in database design depend on?

Real life possibility rather than on the current set of data (A) Signup and view all the answers

What is the main purpose of the Entity-Relationship (ER) model in database design?

To describe the data to be stored and the constraints over the data (B) Signup and view all the answers

What is a key in the context of database design?

A minimal set of attributes whose values uniquely identify an entity in the set (A) Signup and view all the answers

What does it mean for a key to be 'minimal' in the context of database design?

It is the smallest possible set of attributes that can uniquely identify an entity (A) Signup and view all the answers

What is a superkey in the context of database design?

Any set of attributes which can uniquely identify an entity (D) Signup and view all the answers

What stage in the database design process involves understanding the information requirements and the constraints to be applied to the data?

Requirement analysis (D) Signup and view all the answers

Database Design: Entity-Relationship Model (ER Model)

Choose a study mode

Podcast

Questions and Answers

In the database design process, which stage involves understanding the information requirements and the constraints to be applied to the data?

What is a superkey in the context of database design?

What is a key also known as in the context of database design?

What is an Entity-Relationship (ER) diagram used for in database design?

What should the selection of a key in database design depend on?

What is the main purpose of the Entity-Relationship (ER) model in database design?

What is a key in the context of database design?

What does it mean for a key to be 'minimal' in the context of database design?

What is a superkey in the context of database design?

What stage in the database design process involves understanding the information requirements and the constraints to be applied to the data?

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