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Listing 2's query produces the correct summary for the Pies workshop, as Figure 1 shows. By using the query that Listing 2 shows, you can easily generate a summary for one workshop at a time. The assignment seems easy, but unfortunately, something isn't working. For each workshop, the summary must show the number of invoices, the total fees, and the total unpaid balance. Your mission is to produce a summary report for all workshops. The Registrants1 table tracks customers, and each row in that table holds a customer's name, the workshop he or she signed up for, and the associated invoice number. Each row represents one invoice and contains a unique invoice ID, the total fee, and the balance due on that invoice after you deduct any prepayment the customer sent with the registration. When the company receives a workshop registration form, you generate an invoice and insert the invoice details as a new row in the Invoices1 table. You didn't design the database, but you're responsible for using and maintaining it. Listing 1's code creates a simplified version of the tables you use to track workshop participants and payments and that inserts some sample data into those tables. Suppose you're the developer who posted the question and you work for Everything Made Easy, Inc., an organization that runs workshops about a variety of topics, including pie making, wallpaper hanging, and plumbing. If you want to work through the original scenario or understand the newsgroup participants' thought processes, you can read the original newsgroup thread, "GROUP BY Problem," at. Let's look at the clues we discovered and see how they helped solve the mystery. The result was a working query that also provided some insight into database design. Theory met practice, and the developer who originally posted the question got a by-the-book solution. This real-world problem turned out to be a textbook example of the importance of understanding normalization, functional dependencies, and anomalies. But as I and a few other newsgroup participants looked into the problem, we discovered that the database contained redundant information because the design failed to enforce a business rule. All the evidence showed that the query should work.
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The problem was a mystery-the query was simple, and the syntax was correct. The developer had written a GROUP BY query, but it wasn't working.
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Like other SQL Server Most Valuable Professionals (MVPs), I read this newsgroup almost daily, and this post caught my attention. In November 2001, a SQL Server developer posted a seemingly simple problem to the public newsgroup.