Using the output shown in Figure P7.12 as your guide, generate a list of customer purchases, including the subtotals for each of the invoice line numbers. The subtotal is a derived attribute calculated by multiplying LINE_UNITSS by LINE_PRICE . Sort the output by customer code, invoice number, and product description. Be certain to use the column aliases as shown in the figure. CUs CODE Units Bought INV_NUMBER P_DESCRIPT Unit Price Subtotal Rat-tail file, 1/8-in. fine 10011 1002 2.00 4.99 9.98 10011 1004 Claw hammer 2.00 9.95 19.90 Rat-tail file, 1/8-in. fine 10011 1004 3.00 4.99 14.97 10011 1008 Claw hammer 1.00 9.95 9.95 10011 1008 PVC pipe, 3.5-in., 8-ft 5.00 5.87 29.35 10011 1008 Steel matting, 48'x1/6", .5" mesh 3.00 119.95 359.85 10012 1003 7.25-in. pwr. saw blade 5.00 14.99 74.95 10012 1003 B&D cordless drill, 1/2-in. 1.00 38.95 38.95 10012 1003 Hrd. cloth, 1/4-in., 2x50 1.00 39.95 39.95 10014 1001 7.25-in. pwr. saw blade 1.00 14.99 14.99
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
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
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