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.

2. Write a SELECT statement that returns the name and discount percent of each product that has a unique discount percent. In other words, dont include products that have the same discount percent as another product.

Sort the result set by the product_name column.

3. Use a correlated subquery to return one row per customer, representing the customers oldest order (the one with the earliest date). Each row should include these three columns: email_address, order_id, and order_date.

Sort the result set by the order_date and order_id columns.

***Using Mysql, my_guitar_shop