19. Write a query to generate the total number of invoices, the invoice total for all of the invoices, the smallest of the customer purchase amounts, the largest of the customer purchase amounts, and the average of all the customer purchase amounts. Your output must match Figure P7.19. Figure P7.19. Number of Invoices, Invoice Totals, Minimum, Maximum, and Average Sales Total Invoices Total Sales Minimum Customer Purchases Largest Customer Purchases Average Customer Purchases 1126.03 34.97 444.00 225.21

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Transaction Processing

Transaction processing is a computational style generally performed by server computers, which supports interactive applications (apps). Transaction processing is also known as information processing, which divides the work into indivisible and individual operations called transactions. The transaction is a set of tasks; a single task is considered as the minimum processing unit that cannot be divided again.