Chapter 6: How to Code Summary Queries

1. Write a SELECT statement that returns one row for each customer that has orders with these columns:

The email_address column from the Customers table

The sum of the item price in the Order_Items table multiplied by the quantity in the Order_Items table

The sum of the discount amount column in the Order_Items table multiplied by the quantity in the Order_Items table

Sort the result set in descending sequence by the item price total for each customer.

2. Write a SELECT statement that returns one row for each customer that has orders with these columns:

The email_address column from the Customers table

A count of the number of orders

The total amount for each order (Hint: First, subtract the discount amount from the price. Then, multiply by the quantity.)

Return only those rows where the customer has more than 1 order.

Sort the result set in descending sequence by the sum of the line item amounts.

3. Modify the solution to exercise 2 so it only counts and totals line items that have an item_price value thats greater than 200.

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