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In the main text, I claim that it s not required to test whether an attribute that depends on OrderNo (such as OrderTotal) also depends on an attribute that doesn t depend on OrderNo (such as Product). The reason for this is because it s impossible for an attribute to depend on two other attributes unless there s at least one dependency between those two attributes. I already know that Product doesn t depend on OrderNo, and I test for the reverse dependency in this step. If OrderNo depends on Product, then the transitive dependency from Product to OrderTotal is automatically implied and there s no need to test for it. And if OrderNo doesn t depend on Product, then there s no way that OrderTotal could depend on it. The reason for this impossibility is hard to explain in abstract terms, but obvious to explain by using a concrete example. Suppose we have two orders, one with order ID 1, product Gizmo, and an order total of $100.00, and the other with order ID 2, product Dooble, and an order total of $200.00. Because order total depends on order ID, order ID 1 can only be associated with an order total of $100.00. And if order total also depended on product, than the product Dooble should always be associated with an order total of $200.00. The absence of any functional dependency between order ID and product implies that it s allowed to add a row with order ID 1 and product Dooble. But what should the order total of that row be Product ID 1 implies it should be $100.00, but product Dooble implies it has to $ 200.00. The only possible conclusion is that this particular set of functional dependencies can t exist.

To add a built-in icon to a dialog box, add the with icon parameter and specify the appropriate icon Table 8-1 shows the three built-in icons and suggests when to use them For example, the following statement causes the Finder to display a two-button dialog box that includes a Caution icon (see Figure 8-9):

After removing Price from the table, I still have three attributes left to test for singleattribute dependencies: Qty, TotalPrice, and OrderTotal. The first two are exactly like Product: I haven t yet found any dependency for them. And OrderTotal is exactly like CustomerName and CustomerID, because it also depends on OrderNo. So the same rules apply when testing the functional dependencies for these three attributes. The modified data I used to test these attributes is represented in tables 6, 7, and 8.

rier frequency; the slower fluctuation is a duplication of the modulating data The carrier pulsations are smoothed out by passing the output through a capacitor large enough to hold the charge for one carrier current cycle, but not so large that it smoothes out the cycles of the modulating signal This scheme is known as envelope detection

tell the application "Finder" to display dialog "Do you want to delete this document " & return & return & tab & docName with title "Workflow Streamliner: Delete Document" buttons {"Delete File", "Keep File"} default button 2 cancel button 2 with icon caution

over 50 sessions at conferences in Europe and North America and has authored two other books. Joe served for six years on the Board of Directors for the Professional Association for SQL Server (PASS), an international user group with 30,000 members worldwide. He culminated his tenure on the board by serving as the Executive Vice President of Finance for the organization. Joe also volunteers his time by serving on the MBA Advisory Board for Auburn University and the Computer Science Advisory Committee for Nashville State Community College. When he s not consulting, Joe enjoys spending time with his family and tending to the animals and garden on his small farm in middle Tennessee. He can be reached at joew@webbtechsolutions.com.

This chapter covers two practical topics in SQL Server table partitioning: Strategies for creating partition functions Minimizing data movement Large SQL Server databases can become difficult to manage due to their size. Usually such large databases have only a couple of large tables that account for most of the databases size. Table partitioning is a method for making those large tables easier to manage, and in some cases improving query performance against those large tables. Table partitioning is an involved topic and can quickly become complex; therefore, this chapter is going to have a limited scope. Let s look at table partitioning from a general point of view, and then zero in on the two topics mentioned previously.

To give your scripts a custom look or to convey exactly the information required, you can make your dialog boxes display custom icons This is great when you need to use a company logo or other standard icon in your dialog boxes