my-guitar-shop-database-exersices/How-to-retrieve-data-from-a-single-table.sql

-- Exercise 1
SELECT product_code, product_name, list_price, discount_percent
FROM products
ORDER BY list_price DESC;

-- Exercise 2
SELECT CONCAT(last_name, ', ', first_name) AS full_name
FROM customers
WHERE last_name >= 'M%'
ORDER BY last_name ASC;

-- Exercise 3
SELECT product_name, list_price, date_added
FROM products
WHERE list_price > 500 AND list_price < 2000
ORDER BY date_added DESC;

-- Exercise 4
SELECT product_name, list_price, discount_percent, 
	   ROUND((discount_percent/100) * list_price, 2) AS discount_amount,
       ROUND(list_price - (discount_percent/100) * list_price, 2) AS discount_price
FROM products
ORDER BY discount_price DESC
LIMIT 5;

-- Exercise 5
SELECT item_id, item_price, discount_amount, quantity, item_price * quantity AS price_total,
       discount_amount * quantity AS discount_total, (item_price - discount_amount) * quantity AS item_total
FROM order_items
WHERE ((item_price - discount_amount) * quantity) > 500
ORDER BY item_total DESC;

-- Exercise 6
SELECT order_id, order_date, ship_date
FROM orders
WHERE ship_date IS NULL;

-- Exercise 7
SELECT NOW() AS today_unformatted, date_format(NOW(), '%d-%b-%Y') AS today_formatted;

-- Exercise 8
SELECT 100 AS price, 0.07 AS tax_rate, 100 * 0.07 AS tax_amount, 100 + (100 * 0.07) AS total;