Chapter 5 How to code summary queries Exercises 1. Write a SELECT statement that
ID: 3550647 • Letter: C
Question
Chapter 5
How to code summary queries
Exercises
1. Write a SELECT statement that returns these columns:
The count of the number of orders in the Orders table
The sum of the TaxAmount columns in the Orders table
2. Write a SELECT statement that returns one row for each category that has products with these
columns:
The CategoryName column from the Categories table
The count of the products in the Products table
The list price of the most expensive product in the Products table
Sort the result set so the category with the most products appears first.
3. Write a SELECT statement that returns one row for each customer that has orders with these
columns:
The EmailAddress column from the Customers table
The sum of the item price in the OrderItems table multiplied by the quantiy in the
OrderItems table
The sum of the discount amount column in the OrderItems table multiplied by the quantiy
in the OrderItems table
Sort the result set in descending sequence by the item price total for each customer.
4. Write a SELECT statement that returns one row for each customer that has orders with these
columns:
The EmailAddress 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 than 1 order.
Sort the result set in descending sequence by the sum of the line item amounts.
5. Modify the solution to exercise 4 so it only counts and totals line items that have an ItemPrice value
thats greater than 400. 6. Write a SELECT statement that answers this question: What is the total amount ordered for each
product? Return these columns:
The product name from the Products table
The total amount for each product in the OrderItems table (Hint: You can calculate the
total amount by subtracting the discount amount from the item price and then multiplying
it by the quantity)
Use the WITH ROLLUP operator to include a row that gives the grand total.
7. Write a SELECT statement that answers this question: Which customers have ordered more than one
product? Return these columns:
The email address from the Customers table
The count of distinct products from the customers orders
Explanation / Answer
1) SELECT count(*), sum(TaxAmount) from Orders;
2)Select C.CategoryName, count(*), max(P.price) from Categories C, Products P
where C.CategoryName=P.CategoryName
group by C.CategoryName order be count(*) desc;
3) SELECT C.EmailAddress, sum(O.itemPrice*O.quantity), sum(O.discount*O.quantity)
from customer C, OrderItems O
where C.customerId=O.customerId
group by C.EmailAddress order by sum(O.itemPrice*O.quantity);
4) Select C.EmailAddress, count(*), sum(O.itemPrice-O.discount*O.quantity)
from Customers C, Orders O
where C.customerId = O.customerId
group by C.EmailAddress;
5) Select C.EmailAddress, count(*), sum(O.itemPrice-O.discount*O.quantity)
from Customers C, Orders O
where C.customerId = O.customerId and O.itemPrice>400.6
group by C.EmailAddress;
6)Select productName, sum(O.itemPrice-O.discount*O.quantity)
from product
group by productName
with rollup;
7)SELECT C.EmailAddress, count(*)
from customer C, OrderItems O
where C.customerId=O.customerId
group by C.EmailAddress having count(*)>1;
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