Our example store is running a sale and all products are 10% off. Write a SQL statement that returns prod_id, prod_price, and sale_price from the Products table. sale_price is a calculated field that contains, well, the sale price. Here’s a hint, you can multiply by 0.9 to get 90% of the original value (and thus the 10% off price).
SELECT prod_id, prod_price, prod_price * 0.9 AS sale_price FROM Products;