MySQL Table & Views

In MySQL, a view is a virtual table that represents the result of a pre-defined SQL statement. Views are useful for hiding the complexity of a query and providing a simplified interface for querying data. In this tutorial, we'll discuss how to create views in MySQL and how they differ from tables.

Syntax

The syntax for creating a view in MySQL is as follows:

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

Here, view_name is the name of the view you want to create, column1, column2, etc. are the columns you want to include in the view, and table_name is the table you want to create the view from. You can also include a WHERE clause to filter the rows in the view.

Example

Let's say we have a table called employees with columns id, name, department, and salary. We can create a view called high_salary_employees that only includes rows for employees with a salary greater than 50000 as follows:

CREATE VIEW high_salary_employees AS
SELECT id, name, department, salary
FROM employees
WHERE salary > 50000;

Now, we can query the high_salary_employees view just like any other table:

SELECT *
FROM high_salary_employees;

Output

When we run the example code above, we will see the rows from the high_salary_employees view that have a salary greater than 50000.

Explanation

In the example above, we used the CREATE VIEW statement to create a new view called high_salary_employees that includes rows from the employees table where the salary is greater than 50000. We then queried the high_salary_employees view to get the results.

Use

Views can be very useful for hiding the complexity of a query and providing a simplified interface for querying data. They can also be used to restrict access to sensitive data by only allowing users to query a view that includes the necessary data.

Important Points

• Views are virtual tables that represent the results of a pre-defined SQL statement.
• Views can be used just like tables in queries.
• Views can be used to hide the complexity of a query and provide a simplified interface for querying data.
• Views can be used to restrict access to sensitive data.

Summary

In this tutorial, we discussed how to create views in MySQL and how they differ from tables. We covered the syntax, example, output, explanation, use, and important points of views in MySQL. With this knowledge, you can now create views in MySQL to simplify complex queries and provide a simplified interface for querying data.