Using MYSQL, my_guitar_shop

Chapter 7: How to Code Subqueries

1. Write a SELECT statement that returns three columns: email_address, order_id, and the order total for each customer. To do this, you can group the result set by the email_address and order_id columns. In addition, you must calculate the order total from the columns in the Order_Items table.

Write a second SELECT statement that uses the first SELECT statement in its FROM clause. The main query should return two columns: the customers email address and the largest order for that customer. To do this, you can group the result set by the email_address. Sort the result set by the largest order in descending sequence.