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USB Capture Devices Many USB capture devices have three RCA-type jacks two inputs for audio (one for the left channel and one for the right), with another RCA jack for composite video Some of these devices also provide an S-Video input If you have a laptop computer, you can connect your analog video camera or VCR to your computer using a USB capture device..

C# public interface IServiceLocator : IServiceProvider { object GetInstance(Type serviceType); object GetInstance(Type serviceType, string key); IEnumerable<object> GetAllInstances(Type serviceType); TService GetInstance<TService>(); TService GetInstance<TService>(string key); IEnumerable<TService> GetAllInstances<TService>(); }

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As you can see in the plan, the index on the qty column is scanned only once, and both aggregates are calculated with the same scan. Of course, in SQL Server 2005 you can use a common table expression (CTE), which you might find easier to read:

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WITH Agg AS ( SELECT SUM(qty) AS sumqty, AVG(qty) AS avgqty FROM dbo.sales ) SELECT stor_id, ord_num, title_id, CONVERT(VARCHAR(10), ord_date, 120) AS ord_date, qty, CAST(1.*qty / sumqty * 100 AS DECIMAL(5, 2)) AS per, qty - avgqty as diff FROM dbo.sales, Agg;

The Service Locator is extended in the Prism Library with the extension methods shown in the following code. You can see that IServiceLocator is used for resolving only, which means that it is used to obtain an instance; it is not used for registration.

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You will find that both queries generate the same plan. In 6, I'll demonstrate how to use the new OVER clause in SQL Server 2005 to tackle similar problems. Once you're done experimenting with this technique, drop the index on the qty column: DROP INDEX dbo.sales.idx_qty;

Page 243 In the preceding example, the Producer presentation will start playback at the second event, not at one minute. Using parameters in your playback address can give you a great deal of flexibility in how your presentation is displayed.

Inner joins are used to match rows between two tables based on some criterion Out of the first three query logical processing phases, inner joins apply the first twonamely, Cartesian product and ON filter There's no phase that adds outer rows Consequently, if an INNER JOIN query contains both an ON clause and a WHERE clause, logically they are applied one after the other With one exception, there's no difference between specifying a logical expression in the ON clause or in the WHERE clause of an INNER JOIN, because there's no intermediate step that adds outer rows between the two The one exception is when you specify GROUP BY ALL Remember that GROUP BY ALL adds back groups that were filtered out by the WHERE clause, but it does not add back groups that were filtered out by the ON clause.

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Remember also that this is a nonstandard legacy feature that you should avoid using As for performance, when not using the GROUP BY ALL option, you will typically get the same plan regardless of where you place the filter expression That's because the optimizer is aware that there's no difference I should always be cautious when saying such things related to optimization choices because the process is so dynamic As for the two supported join syntaxes, using the ANSI SQL:1992 syntax, you have more flexibility in choosing which clause you will use to specify a filter expression Because logically it makes no difference where you place your filters, and typically there's also no performance difference, your guideline should be natural and intuitive writing Write in a way that feels more natural to you and to the programmers who need to maintain your code.

C# ServiceLocatorExtensions public static class ServiceLocatorExtensions { public static object TryResolve(this IServiceLocator locator, Type type) { try { return locator.GetInstance(type); } catch (ActivationException) { return null; } } public static T TryResolve<T>(this IServiceLocator locator) where T: class { return locator.TryResolve(typeof(T)) as T; } }

For example, to me a filter that matches attributes between the tables should appear in the ON clause, while a filter on an attribute from only one table should appear in the WHERE clause I'll use the following query to return orders placed by US customers: USE Northwind; SELECT CCustomerID, CompanyName, OrderID FROM dboCustomers AS C JOIN dboOrders AS O ON CCustomerID = OCustomerID WHERE Country = 'USA';.

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Using the ANSI SQL:1989 syntax, you have no choice but to specify all filter expressions in the WHERE clause: SELECT C.CustomerID, CompanyName, OrderID FROM dbo.Customers AS C, dbo.Orders AS O WHERE C.CustomerID = O.CustomerID AND Country = 'USA';

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