SQL Views.

Sql Views Are Virtual Tables That Allow You To Organize And Simplify Complex Queries By Combining Data From Multiple Tables. Views Can Be Used To Restrict Access To Sensitive Data Or To Present Data In A Specific Way That Is More Meaningful To Users.

Here Is An Example Of How To Create A View In Sql:

Suppose You Have A Database With Two Tables: "Customers" And "Orders". The "Customers" Table Has Columns For Customer Id, Name, Address, And Email, While The "Orders" Table Has Columns For Order Id, Customer Id, Order Date, And Total Price.

To Create A View That Displays The Customer Name And Email Along With The Order Date And Total Price For Each Order, You Could Use The Following Sql Statement:

```

Create View Order_Summary As

Select Customers.Name, Customers.Email, Orders.Order_Date, Orders.Total_Price

From Customers

Inner Join Orders

On Customers.Customer_Id = Orders.Customer_Id;

```

This Sql Statement Creates A View Called "Order_Summary" That Combines Data From The "Customers" And "Orders" Tables Using A Join. The View Includes Four Columns: Customer Name, Customer Email, Order Date, And Total Price.

Once The View Is Created, You Can Query It Just Like A Regular Table Using A Select Statement:

```

Select * From Order_Summary;

```

This Sql Statement Will Return All Rows And Columns From The "Order_Summary" View, Displaying The Customer Name, Email, Order Date, And Total Price For Each Order In The Database.

It's Important To Note That Views Do Not Actually Store Data Themselves, But Rather Provide A Way To Access Data From Underlying Tables In A Specific Way. Any Changes Made To The Underlying Tables Will Be Reflected In The View As Well.