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Views - ( SQL Server Database )

In SQL Server Database, a View is a virtual table whose contents are defined by a query. Views can be queried just like a table, and can be used to simplify queries by abstracting away complex joins or aggregations. This page will discuss the syntax, examples, output, explanation, use, important points, and summary of views in SQL Server Database.

Syntax

Here is the syntax for creating a view in SQL Server Database:

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

The CREATE VIEW statement is used to create a view in SQL Server Database. The view name must be unique within the database.

Example

Here's an example of creating a view in SQL Server Database:

CREATE VIEW vw_Employee AS
SELECT EmployeeID, FirstName, LastName, HireDate, Title
FROM Employees
WHERE Title LIKE 'Sales%';

This creates a view named vw_Employee. The view contains the EmployeeID, FirstName, LastName, HireDate, and Title columns from the Employees table where the employee's Title starts with "Sales".

Output

When a view is created in SQL Server Database, it stores the query definition as metadata in the database. When a query is executed against the view, the database engine retrieves the necessary data from the base tables and presents it as if it were a regular table.

Explanation

Views in SQL Server Database provide a way to store complex queries as reusable objects. By abstracting complex joins or aggregations into views, you can simplify queries and make them easier to read and understand. Views also provide a layer of security by allowing you to restrict access to the underlying tables while still allowing access to the data through the view.

Use

Views are useful for simplifying complex queries, abstracting away complex joins or aggregations, and providing a layer of security. Views can also be used to create a denormalized view for reporting purposes, or to hide sensitive data from certain users.

Important Points

  • Views are virtual tables whose contents are defined by a query.
  • Views can be queried just like a table.
  • Views provide a way to store complex queries as reusable objects.
  • Views also provide a layer of security by allowing you to restrict access to the underlying tables while still allowing access to the data through the view.

Summary

In this page, we discussed the syntax, examples, output, explanation, use, important points, and summary of views in SQL Server Database. Views provide a way to simplify queries, abstract away complex joins or aggregations, and provide a layer of security. By using views, you can make queries easier to read and understand, while also providing a layer of protection for sensitive data.

ALTER TableMIN Function
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