Page 62 - Modular_V2.0_SQL_Flipbook

2. When you are working with aggregate functions or need to add new columns in the view, the

following syntax is used:

CREATE OR REPLACE VIEW view_name AS
SELECT column1, column2, ...

FROM table_name

WHERE condition;
Example using tables: PRODUCTS and SALES

CREATE OR REPLACE VIEW PRODUCT_SALES AS

SELECT PRODUCTS.Product_name, PRODUCTS.Price, SALES.Quantity, SALES.Discount,
(SALES.Quantity * PRODUCTS.Price) AS Total_sales FROM PRODUCTS, SALES

WHERE PRODUCTS.Product_id = SALES.Product_id;
You will replace the PRODUCT_SALES view and add an additional column, such as Total_sales,

which can be calculated by multiplying Quantity and Price.

SELECT * FROM PRODUCT_SALES;
Output:
+--------------+-------+----------+----------+-------------+
| Product_name | Price | Quantity | Discount | Total_sales |
+--------------+-------+----------+----------+-------------+
| Laptop | 50000 | 5 | 500 | 250000 |
+--------------+-------+----------+----------+-------------+
| Smartphone | 15000 | 10 | 1000 | 150000 |
+--------------+-------+----------+----------+-------------+
| Headphones | 2500 | 15 | 300 | 37500 |
+--------------+-------+----------+----------+-------------+
| Keyboard | 1500 | 8 | 100 | 12000 |
+--------------+-------+----------+----------+-------------+
INSERT INTO View

You can insert values into a virtual table (view) created using views. Syntax for inserting values in a
view is as follows:

INSERT INTO table_name (column1, column2,...) VALUES (value1, value2,....);
Where value1, value2, etc., correspond to the values inserted into column1, column2, and so on.

Example using tables: PRODUCTS and SALES

INSERT INTO PRODUCT_SALES (Product_name, Price, Quantity, Discount) VALUES
('Monitor', 12000.00, 10, 400.00);

SELECT * FROM PRODUCT_SALES;

This command will fetch all the new values along with the previous ones from the view
PRODUCT_SALES;

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