made the remaining exercises

How-to-code-subqueries.sql

@@ -1,19 +1,81 @@
 -- Exercise 1
 
+SELECT category_name
+FROM categories
+WHERE category_id IN 
+(SELECT DISTINCT category_id FROM products)
+ORDER BY category_name;
 
 -- Exercise 2
 
+SELECT 
+product_name,
+list_price
+FROM products
+WHERE list_price > 
+(SELECT AVG(list_price)
+FROM products)
+ORDER BY list_price DESC;
 
 -- Exercise 3
 
+SELECT category_name
+FROM categories
+WHERE NOT EXISTS 
+(SELECT *
+FROM products
+WHERE category_id = categories.category_id);
 
 -- Exercise 4
 
+SELECT 
+email_address,
+i.order_id,
+SUM((i.item_price - i.discount_amount) * quantity) AS 'order_total'
+FROM customers c JOIN orders o
+ON c.customer_id = o.customer_id
+JOIN order_items i
+ON o.order_id = i.order_id
+GROUP BY email_address, order_id;
 
 -- Exercise 4 Part 2
 
+SELECT 
+email_address,
+MAX(order_total)
+FROM 
+(SELECT email_address,
+i.order_id,
+SUM((i.item_price - i.discount_amount) * quantity) AS 'order_total'
+FROM customers c JOIN orders o
+ON c.customer_id = o.customer_id
+JOIN order_items i
+ON o.order_id = i.order_id
+GROUP BY email_address, order_id) f
+GROUP BY email_address;
 
 -- Exercise 5
 
+SELECT 
+product_name,
+discount_percent
+FROM products
+WHERE discount_percent NOT IN 
+(SELECT discount_percent
+FROM products
+GROUP BY discount_percent
+HAVING COUNT(discount_percent) > 1)
+ORDER BY product_name;
 
 -- Exercise 6
+
+SELECT 
+email_address,
+order_id,
+order_date
+FROM customers c JOIN orders o
+ON c.customer_id = o.customer_id
+WHERE order_date = 
+(SELECT MIN(order_date)
+FROM orders
+WHERE customer_id = o.customer_id);

How-to-code-summary-queries.sql

@@ -1,19 +1,81 @@
 -- Exercise 1
 
+SELECT 
+COUNT(order_id),
+SUM(tax_amount)
+FROM orders;
 
 -- Exercise 2
 
+SELECT 
+category_name,
+COUNT(product_id) AS count,
+MAX(list_price) AS max_price
+FROM categories c JOIN products p
+ON c.category_id = p.category_id
+GROUP BY category_name
+ORDER BY category_name DESC;
 
 -- Exercise 3
 
+SELECT 
+c.email_address,
+SUM(item_price) * quantity,
+SUM(discount_amount) * quantity
+FROM orders o JOIN order_items i 
+ON o.order_id = i.order_id
+JOIN customers c 
+ON o.customer_id = c.customer_id
+GROUP BY c.customer_id
+ORDER BY item_price DESC;
 
 -- Exercise 4
 
+SELECT 
+c.email_address,
+COUNT(i.order_id),
+SUM(item_price - discount_amount) * quantity AS 'total_amount'
+FROM orders o JOIN order_items i
+ON i.order_id = o.order_id
+JOIN customers c
+ON o.customer_id = c.customer_id
+GROUP BY email_address
+HAVING COUNT(i.order_id) > 1
+ORDER BY SUM(item_price - discount_amount) * COUNT(i.order_id) DESC;
 
 -- Exercise 5
 
+SELECT 
+c.email_address,
+COUNT(i.order_id),
+SUM(item_price - discount_amount) * quantity AS 'total_amount'
+FROM orders o JOIN order_items i
+ON i.order_id = o.order_id
+JOIN customers c
+ON o.customer_id = c.customer_id
+WHERE i.item_price > 400
+GROUP BY email_address
+HAVING COUNT(i.order_id) > 1
+ORDER BY SUM(item_price - discount_amount) * COUNT(i.order_id) DESC;
 
 -- Exercise 6
 
+SELECT 
+product_name,
+SUM(item_price - discount_amount) * quantity AS 'total_amount'
+FROM products p JOIN order_items i
+ON p.product_id = i.product_id
+GROUP BY product_name WITH ROLLUP;
 
 -- Exercise 7
+
+SELECT 
+email_address,
+COUNT(product_id) AS 'distinct_products'
+FROM customers c JOIN orders o
+ON c.customer_id = o.customer_id
+JOIN order_items i 
+ON o.order_id = i.order_id
+GROUP BY email_address
+HAVING COUNT(o.order_id) > 1;
+

How-to-insert-update-and-delete-data.sql

@@ -1,30 +1,53 @@
 -- Exercise 1
 
+INSERT INTO categories
+VALUES (default, 'Brass');
 
 -- Exercise 2
 
+UPDATE categories
+SET category_name = 'Woodwinds'
+WHERE category_id = 5;
 
 -- Exercise 3
 
+DELETE FROM categories
+WHERE category_id = 5;
 
 -- Exercise 4
 
+INSERT INTO products (product_id, category_id, product_code, product_name, description, list_price, discount_percent, date_added)
+VALUES (default, 4, 'dgx_640', 'Yamaha DGX 640 88-Key Digital Piano', 'Long description to come.', 799.99, 0, now());
 
 -- Exercise 5
 
+UPDATE products
+SET discount_percent = 35
+WHERE product_id = 11;
 
 -- Exercise 6
 
+DELETE FROM categories
+WHERE category_id = 4;
+DELETE FROM products
+WHERE product_id = 11;
 
 -- Exercise 7
 
+INSERT INTO customers (email_address, password, first_name, last_name)
+VALUES ('rick@raven.com', '', 'Rick', 'Raven');
 
 -- Exercise 8
 
+UPDATE customers
+SET password = 'secret'
+WHERE email_address = 'rick@raven.com';
 
 -- Exercise 9
 
+UPDATE customers
+SET password = 'reset'
+LIMIT 100
 
 -- Exercise 10
 
-

How-to-retrieve-data-from-a-single-table.sql

@@ -1,22 +1,65 @@
 -- Exercise 1
-
+SELECT 
+product_code, 
+product_name, 
+list_price, 
+discount_percent
+FROM products
+ORDER BY list_price;
 
 -- 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(list_price * discount_percent/100, 2)  AS discount_amount,
+round(list_price - list_price * discount_percent/100, 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;

How-to-retrieve-data-from-two-or-more-tables.sql

@@ -1,19 +1,73 @@
 -- Exercise 1
+SELECT 
+category_name, 
+product_name, 
+list_price
+FROM categories c JOIN products p
+ON c.category_id = p.category_id
+ORDER BY category_name, product_name ASC;
 
 
 -- Exercise 2
-
+SELECT 
+first_name, 
+last_name, 
+line1, 
+city, 
+state, zip_code
+FROM customers c JOIN addresses a
+ON c.customer_id = a.customer_id
+WHERE email_address LIKE 'allan.sherwood@yahoo.com';
 
 -- Exercise 3
-
+SELECT 
+first_name, 
+last_name, 
+line1, 
+city, 
+state, 
+zip_code
+FROM customers c JOIN addresses a
+ON c.customer_id = a.customer_id
+WHERE c.shipping_address_id = a.address_id;
 
 -- Exercise 4
-
+SELECT 
+last_name, 
+first_name, 
+order_date, 
+product_name, 
+item_price, 
+discount_amount, 
+quantity
+FROM customers c JOIN orders o
+ON c.customer_id = o.customer_id
+JOIN order_items oi
+ON oi.order_id = o.order_id
+JOIN products p 
+ON p.product_id = oi.product_id
+ORDER BY last_name, order_date, product_name;
 
 -- Exercise 5
-
+SELECT 
+p1.product_name, 
+p1.list_price
+FROM products p1 JOIN products p2
+ON p1.list_price = p2.list_price
+AND p1.product_id <> p2.product_id;
 
 -- Exercise 6
-
+SELECT *
+FROM categories c JOIN products p
+ON p.category_id = c.category_id
+WHERE p.product_id IS NULL;
 
 -- Exercise 7
+SELECT 'SHIPPED' AS ship_status, order_id, order_date
+FROM orders
+WHERE ship_date IS NOT NULL
+UNION
+SELECT 'NOT SHIPPED' AS ship_status, order_id, order_date
+FROM orders
+WHERE ship_date IS NULL
+ORDER BY order_date;