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Furthermore, relations in compound queries are processed from left to right. The union operation takes two relations, A and B, and combines them into a single relation containing all distinct rows of A and B. In SQL, union combines the results of two select statements. By default, union eliminates duplicates. If you want duplicates included in the result, then use union all. For example, the following SQL finds the single most and single least frequently mentioned foods: select f.*, top_foods.count from foods f inner join (select food_id, count(food_id) as count from foods_episodes group by food_id order by count(food_id) desc limit 1) top_foods on f.id=top_foods.food_id union select f.*, bottom_foods.count from foods f inner join (select food_id, count(food_id) as count from foods_episodes group by food_id order by count(food_id) limit 1) bottom_foods on f.id=bottom_foods.food_id order by top_foods.count desc; id ----288 1 type_id name ------- --------10 Hot Dog 1 Bagels top_foods.count --------------5 1

Web services have no reason to exist unless they are being used by clients. In this step, you generate a proxy class file based on the Web service WSDL document so that clients know how to call your Web service, and know what messages and data types will be exchanged. The wsdl.exe command-line tool will automatically generate this proxy class for you based on the WSDL document. And Visual Studio 2005 will automatically generate the WSDL document for you, so no manual work is required.

At the time of this writing, the WPF data grid control is simply a project on CodePlex (www.codeplex.com) and is not an official part of the product. However, currently, it uses IEditableObject, as described here.

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Both queries return only one row. The only difference in the two is which way they sort their results. The union simply combines the two rows into a single relation. The intersect operation takes two relations, A and B, and selects all rows in A that also exist in B. The following SQL uses intersect to find the all-time top ten foods that appear in seasons 3 through 5: select f.* from foods f inner join (select food_id, count(food_id) as count from foods_episodes group by food_id order by count(food_id) desc limit 10) top_foods on f.id=top_foods.food_id

Data binding uses the IDataErrorInfo interface to change the display to visually indicate that the property to which a control is bound is invalid. Unlike Windows Forms, which uses an ErrorProvider control to do this, WPF data binding supports this concept natively, and you manage the appearance of a control with an invalid value by using an Extensible Application Markup Language (XAML) style. Because of the differences between Windows Forms and WPF, the only interface needing further discussion is INotifyPropertyChanged.

intersect select f.* from foods f inner join foods_episodes fe on f.id = fe.food_id inner join episodes e on fe.episode_id = e.id where e.season between 3 and 5 order by f.name; id ----4 146 153 55 94 164 317 type_id ------1 7 7 2 4 7 11 name -------------------Bear Claws Decaf Cappuccino Hennigen's Kasha Ketchup Naya Water Pizza

When WPF data binding handles a PropertyChanged event from an object, it assumes that only that specific property has changed. Because of that assumption, data binding updates only those controls that are bound to that specific property. This is fundamentally different from Windows Forms, which updates all controls bound to the same object even if they are bound to different properties. This means that when BusinessBase raises a PropertyChanged event, it needs to act differently for WPF than for Windows Forms. In the case of Windows Forms, even if multiple properties might have changed, it is most efficient to raise PropertyChanged only for one of the properties, since they ll all get refreshed anyway. However, in WPF, it is important to raise PropertyChanged for every property that changes. This includes properties changed directly by the user, as well as properties changed indirectly through business rules or processing. This also includes properties that didn t actually change but may have become valid or invalid because some other property changed. For example, in an Invoice object, the AmountDue property might become invalid when the CreditLimit property is changed. If the object raises only PropertyChanged for CreditLimit, the UI won t display any visual cue to indicate that AmountDue is now invalid. Figure 10-3 illustrates this.

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