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View in SQL

A virtual table called a SQL view is produced as a result of a SELECT command. It doesn’t save any data on its own; instead, it presents data from one or more tables in a certain fashion.

Syntax for creating a view in SQL:

CREATE VIEW view_name AS
SELECT column1, column2, ...
FROM table_name
WHERE condition;

For instance, you could use the following sentence to create a view called “employee_view” that displays all employees from the “employees” table with the last name “Smith”:

CREATE VIEW employee_view AS
FROM employees
WHERE last_name = 'Smith';

The same SELECT statement that you would use to query a table can also be used to query a view. For instance, you could use the following statement to get all rows from the “employee_view” view:

SELECT * FROM employee_view;

Views can be helpful for a variety of things, including:

  1. Query Simplification: Views can be used to divide down large queries into smaller, more manageable chunks, so simplifying them.
  2. Security: By limiting user access to the data that is displayed in the view, you can utilize views to limit access to certain data.
  3. Data integrity: Since views are built using SELECT statements, which are run each time a view is visited, you can make sure that the data displayed is always current by using views.
The author of this blog post is a technology fellow, an IT entrepreneur, and Educator in Kathmandu Nepal. With his keen interest in Data Science and Business Intelligence, he writes on random topics occasionally in the DataSagar blog.
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