Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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List all customers who were referred to the bookstore by another customer. List each customer's last name and the number of the customer who made the referral.
Using the SELECT statement, query the invoice table to find the average
total cost for all orders purchased in the country USA, rounded to the
nearest cent.
O a.) 5.8
O b.) 5.7
O c.) 6
O d.) 5.80
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