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This query has a cost of roughly 76, while the first query s cost was double that, about 151. Another solution to this type of problem is to make use of the ROW_NUMBER function instead of a correlated subquery. By using the ROW_NUMBER function, you can find the specific number of rows that you need by filtering on the row number rather than using the TOP clause. To be able to filter on the result of the ROW_NUMBER function, the query needs to be placed inside a derived table or a common table expression (CTE). The larger the result set, the better this approach performs compared to the previous queries. The cost for the following query drops from 76 to about 3.6, an enormous reduction:

For details about all the practice test options available, see the How to Use the Practice Tests sec tion in this book s Introduction.

"AND OrderDate > @StartDate AND OrderDate < @EndDate "

sqlString += "AND ShipMethodID = @ShipMethodID "

-- Common table expression. WITH a AS ( SELECT soh.SalesOrderID ,soh.OrderDate ,sod.UnitPrice ,sod.OrderQty ,ROW_NUMBER() OVER ( PARTITION BY soh.SalesOrderID ORDER BY sod.OrderQty DESC ) AS RowNo FROM Sales.SalesOrderDetail AS sod INNER JOIN Sales.SalesOrderHeader AS soh ON sod.SalesOrderID = soh.SalesOrderID WHERE soh.TerritoryID = 4 ) SELECT a.SalesOrderID ,a.OrderDate ,a.UnitPrice ,a.OrderQty FROM a WHERE a.RowNo = 1;

9

Dim command As SqlCommand = New SqlCommand(sqlString, sqlConn)

Dim param1 As SqlParameter = New SqlParameter("@VendorID", VendorID)

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The third FOR XML mode is EXPLICIT, which is awkward to write and even more awkward to maintain. The interesting fact about the EXPLICIT mode is that you can create virtually any XML structure, even some not supported by the PATH mode that you learn about later in this lesson. In essence, to create an XML document using FOR XML EXPLICIT, you must return a specific result set; that is, you must name your columns in a specific way. Much like the AUTO mode, you must also sort the results appropriately to reach the desired result. The EXPLCIIT mode result set must contain two columns called Tag and Parent. In the Tag column, you add an integer identifier for each XML element that you want to return, and in the Parent column, you specify the Tag identifier of the XML element that is the element s parent. If the element doesn t have a parent, you specify NULL in the Parent column. The rest of the columns in the result set are used to define both the names and values of the elements and attributes that should be returned. The following example shows how you can create the customer and order example using EXPLICIT mode:

command.Parameters.Add(param1)

XML is a universally used format for communication and storage of information. XML is extensible, platform-independent, and, since it is a text-based format, can be read and written with standard text-editing tools. This chapter describes how to use the Microsoft .NET Framework to read and write XML.

SELECT 1 AS Tag ,NULL AS Parent ,NULL AS "Customers!1!!element" ,NULL AS "Customer!2!Id" ,NULL AS "Customer!2!AccountNumber" ,NULL AS "Order!3!Id" ,NULL AS "Order!3!OrderDate" UNION ALL

Dim param2 As New SqlParameter("@StartDate", StartDate)

command.Parameters.Add(param2)

SELECT 2 AS Tag ,1 AS Parent ,NULL AS "Customers!1!!element" ,c.CustomerID AS "Customer!2!Id" ,c.AccountNumber AS "Customer!2!AccountNumber" ,NULL AS "Order!3!Id" ,NULL AS "Order!3!OrderDate" FROM Sales.Customer AS c WHERE c.CustomerID IN (1,2) UNION ALL SELECT 3 AS Tag ,2 AS Parent ,NULL AS "Customers!1!!element" ,soh.CustomerID AS "Customer!2!Id" ,NULL AS "Customer!2!AccountNumber" ,soh.SalesOrderID AS "Order!3!Id" ,soh.OrderDate AS "Order!3!OrderDate" FROM Sales.SalesOrderHeader AS soh WHERE soh.CustomerID IN (1,2) ORDER BY "Customer!2!Id", Tag FOR XML EXPLICIT;

Exam objectives in this chapter:

Dim param3 As New SqlParameter("@EndDate", EndDate)

command.Parameters.Add(param3)

Here is the result:

Read XML data by using the XmlReader. Read all XML element and attribute content. Read specific element and attribute content. Read XML data by using the XmlTextReader class. Read node trees by using the XmlNodeReader class. Validate XML data by using the XmlValidatingReader. Write XML data by using the XmlWriter class. Manage XML with the XML Document Object Model (DOM). Read XML data into the DOM. Modify an XML document by adding and removing nodes. Modify nodes within an XML document. Write data in XML format from the DOM. Work with nodes in the XML DOM. Handle DOM events. Modify the XML declaration.

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