Views

1What is a View?✨

A view in SQL is a virtual table that is based on the result of a query. It doesn't store the data itself but provides a way to present data from one or more tables in a specific format.

2Why Use Views?🎯

• ✓ Simplify complex queries
• ✓ Enhance security by restricting access to specific data
• ✓ Reuse commonly used queries
• ✓ Improve readability and manageability of SQL code

3Creating a View💡

To create a view, you use the CREATE VIEW statement followed by the view name and the query that defines it. Here's an example:

4CREATE VIEW employee_details AS🚀

• SELECT name, position, salary
• FROM employees
• WHERE active = true;

This creates a view called employee_details that only shows active employees.

5Querying a View🔍

You can query a view just like a regular table. This allows you to easily access the data defined in the view. For example:

6SELECT * FROM employee_details;⭐

This retrieves all records from the employee_details view.

7Updating a View🧩

If the underlying data changes, the view will reflect these changes automatically. However, you can also update the view's definition. To do this, use the CREATE OR REPLACE VIEW statement:

8CREATE OR REPLACE VIEW employee_details AS🎈

• SELECT name, position, salary
• FROM employees
• WHERE active = true AND salary > 50000;

This updates the employee_details view to include only those active employees with a salary greater than 50,000.

9Benefits of Using Views✨

• ✓ Reduces redundancy by encapsulating complex queries
• ✓ Makes your SQL queries cleaner and easier to read
• ✓ Allows for easier maintenance of your SQL code

10What You'll Build This Grade🎯

• ✓ A comprehensive database for a project
• ✓ Simplified reporting tools
• ✓ Efficient data management solutions
• ✓ Interactive dashboards for users