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The outer query returns the customer IDs of all customers from the Customers table . The correlated subquery returns all order IDs from the Orders table for the current customer in the outer row . The purpose of the FOR XML option is to return a single XML instance made of the values returned by the query . To achieve this, the FOR XML option needs to concatenate all values . The combination of providing an empty string as input to the PATH mode and aliasing the expression in the SELECT list as [text()] means that you get simple concatenation of the values returned by the query without tags . The COALESCE function is then used to convert a NULL to an empty string in case the customer has no orders . Note that the use of AS [text()] will apply various XML requirements to special characters, like &, <, and >, converting them to their representative tags (&, <, and >, respectively) . Our specific query concatenates order IDs that are originally integers, hence there s no chance to find special characters in the data . Still, I added logic to address special characters to the query so that you will be able to use it when relevant . This extra logic involves using the TYPE directive that tells SQL Server to returned an XML type instance, and the .value method that retrieves a value from the XML instance, converting the tags back to the original special characters . CLR user-defined aggregates (UDAs) can also solve this problem . I provide detailed coverage of the aforementioned techniques to achieve string concatenation, as well as other custom aggregates in Inside T-SQL Querying . When you re done, run the following code for cleanup:

The important issue to note about native exception handling is that when you see the first chance exception message in the Output window, an exception has occurred in your process As I pointed out, exceptions are a performance bottleneck, so if you're seeing lots of "First-chance exception at " messages when you run your process, you have performance issues The insidious problem here is that C++ exception handling is implemented with structured exception handling (SEH) behind the scenes, so using C++ exceptions can kill your performance Exceptions are for exceptional conditions Avoid C++ exceptions in native applications for general development To track down performance problems related to exceptions, you can always look for exceptions in code reviews However, that can sometimes be a daunting task on a large code base The Exceptions dialog box in Visual Studio .

USE tempdb; IF OBJECT_ID('dbo.LargeOrders') IS NOT NULL DROP TABLE dbo.LargeOrders; CREATE TABLE dbo.LargeOrders ( orderid INT NOT NULL CONSTRAINT PK_LargeOrders PRIMARY KEY NONCLUSTERED, custid INT NOT NULL, empid INT NOT NULL, orderdate DATE NOT NULL, filler CHAR(200) NOT NULL DEFAULT ('a') ) GO CREATE UNIQUE CLUSTERED INDEX idx_od_oid ON dbo.LargeOrders(orderdate, orderid); GO

Let s start with rules of thumb that can save you from a lot of frustration when trying to get your PDF servlet online. These rules may seem trivial, but they re very important.

// If last task, let main thread continue running if (Interlocked.Decrement(ref numToDo) == 0) done.Set(); }, n); } // Wait for all the other threads to finish done.WaitOne(); // Show the results for (Int32 n = 0; n < squares.Length; n++) Console.WriteLine("Index {0}, Square={1}", n, squares[n]); } }

NET can make stopping immediately where exceptions occur and finding where they are handled a complete piece of cake Figure 7-7 shows the Exceptions dialog box that's accessible from the Debug menu or by pressing Ctrl+Alt+E with the default keyboard mappings..

If Startup Repair doesn t solve your problem, or if you know that your problem is not the result of a damaged system file (for example, if you re reasonably certain that a bad device driver is the culprit), you can try returning your system to a more stable state by means of System Restore. For information about using System Restore, see Rolling Back to a Stable State with System Restore, in 23, which describes the use of this tool from within Windows. The one difference between running it in Windows and running it in the Windows Recovery Environment is that in the latter case no new restore point is created at the time you perform the restore. Therefore, if you run System Restore from the Windows Recovery Environment and you re not pleased with the result, you won t have any simple method of undoing the restore. On the other hand, the fact that you re in Windows Recovery Environment to begin with suggests that you have nothing to lose.