What Is a VIEW Database? Definition, Function & Advantages

What Is a VIEW in Database?

A VIEW can be referred to as a virtual table, which is one of the database objects for storing query results. The query result is usually a collection of columns resulting from the execution of a SELECT command. This VIEW object can be stored in a database with a specified name and can be called again to display data without needing to rewrite the query from scratch.

VIEW is defined as a virtual table because essentially this object does not physically store data, so a VIEW does not have its own data. Although it does not store data, a VIEW can display accurate information sourced directly from actual tables based on the SELECT command contained within it.

Relationship Between VIEW and Physical Tables

The relationship between a VIEW and physical tables in a database is that a VIEW is not part of the physical schema like the main tables that make up the database. A VIEW only contains and represents data from those physical tables.

The main characteristic of a VIEW is that it is dynamic. So, when the data from the source physical tables changes, whether added, modified, or deleted, the data displayed when the VIEW is called will also change automatically.

Purpose of Creating a VIEW

There are several main reasons why VIEWs are designed and often used in database management:

• Enhancing Data Security
  A VIEW can be used to provide access restrictions to users. Administrators can hide sensitive columns and only display safe data, thus helping to secure data overall.

• Improving Data Independence
  VIEWs can be used in various systems and applications without the hassle of manually changing the data format.

• Simplification for End Users
  VIEWs are very helpful for end users because they can filter and display less data as needed. Additionally, developers can provide new column names or aliases inside the VIEW that are easier for users to read and understand.

Advantages of Using VIEW

Implementing VIEWs in databases provides several benefits that greatly help developers and administrators, including:

• Efficient in Writing
  VIEWs can simplify complex join queries or JOINs into very simple ones. The query only needs to be written once, saved as a VIEW, and can be called again whenever needed, just like calling a regular table.

• Precise Access Control
  VIEWs are very helpful in restricting data access to specific users, ensuring users can only see data relevant to their access rights.