Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Single Table
In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.
Question

Use a query to compute the total of all purchases, the number of purchases, and the average purchase amount made by each customer. Your output values must match those shown in Figure P7.15. Sort the results by customer code.

CUS CODE CUS BALANCE Total Purchases Number of Purchases Average Purchase Amount 10011 0.00 444.00 6 74.00 10012 345.86 153.85 3 51.28 10014 0.00 422.77 6 70.46 10015 0.00 34.97 2 17.49 10018 216.55 70.44 1 70.44
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Transcribed Image Text:CUS CODE CUS BALANCE Total Purchases Number of Purchases Average Purchase Amount 10011 0.00 444.00 6 74.00 10012 345.86 153.85 3 51.28 10014 0.00 422.77 6 70.46 10015 0.00 34.97 2 17.49 10018 216.55 70.44 1 70.44
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