Database Views

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Questions and Answers

What is the primary characteristic of a view in a database?

It is a result of a single relational operation.
It is a base relation that cannot be modified.
It is a physical relation that exists in the database.
It is a virtual relation that is produced upon request. (correct)

What is the result of one or more relational operations operating on base relations?

A virtual relation
A base relation
A database
A view (correct)

When is a view produced in a database?

When the database is queried
At the time of request (correct)
At the time of database creation
When the database is updated

What is the relationship between a view and a base relation?

A view is derived from a base relation (A) Signup and view all the answers

Why are views useful in a database?

They provide a convenient way to access complex data (C) Signup and view all the answers

What is the key difference between a view and a base relation in a database?

A view is a virtual relation, while a base relation is a physical one (A) Signup and view all the answers

What happens when a view is requested in a database?

The view is produced upon request at the time of request (D) Signup and view all the answers

What is the result of performing relational operations on base relations?

A view is created (C) Signup and view all the answers

What is a common characteristic of a view in a database?

It is produced dynamically (C) Signup and view all the answers

What is the relationship between a view and the database?

A view is a part of the database, but does not exist physically (D) Signup and view all the answers

Study Notes

View

A view is the dynamic result of one or more relational operations performed on base relations to produce another relation.
It is a virtual relation that does not necessarily exist physically in the database.
The view is generated upon request, at the time of the request.
A view does not have a physical existence in the database until it is requested.
It is produced dynamically by the database system when queried.

View

A view is the dynamic result of one or more relational operations performed on base relations to produce another relation.
It is a virtual relation that does not necessarily exist physically in the database.
The view is generated upon request, at the time of the request.
A view does not have a physical existence in the database until it is requested.
It is produced dynamically by the database system when queried.

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Description

Learn about database views, virtual relations that are generated dynamically upon request. Understand how they are produced by the database system and their physical existence.