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During aggregation, the query engine may use multiple instances of the aggregate on different threads Before returning the answer, the intermediate aggregates will all be combined using the Merge method 5 When the last row of a group is detected by the SQL Server engine, the Terminate method is called This method returns the final result of the aggregation At this point, the instance of the UDA may be dereferenced, or it may be reused for another group, in which case Init will be called to clean up the internal state of the aggregate The four methods in a bit more detail are as follows: Init: This method is called when the query engine prepares to begin aggregation Any initialization code specific for the aggregation should be performed here This method should reset the aggregate to a base state, as the same aggregate can be reused for multiple groups.

To test your query, you can click the Run button on the toolbar, represented by the exclamation point icon, to see what results you would get back. As you build more and more reports, you will appreciate the graphical Query Designer and the ability to execute your queries to see what data is returned. This report has a simple query, but you could write distributed queries across multiple data sources that will work with SSRS.

Adding references to a project is as easy as choosing Add Reference... from the Project menu (see Figure 4-17) or by right-clicking on the project and selecting Add Reference... (see Figure 4-18).

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The next step is to lay out your report. Click the Layout tab at the top, and a blank grid should appear. This is your report body. Creating the layout is a matter of dragging Report Item controls such as Table, Lists, Matrices, or other controls onto the grid. Make sure you have selected the Toolbox on the left-hand side and can see the different layout controls. Drag and drop a Table control onto your report. You will see that SSRS automatically sizes the table to the width of your report and the table has a header, detail, and footer. Next, select the Fields tab on the left-hand side. SSRS creates fields for the data that is returned in your dataset. You can also create calculated fields, which do not exist in the dataset but instead are created by writing VB .NET expressions. For example, you could have created a fullname field that combines first and last name together. You need to drag and drop your fields onto your table. Drag FirstName into the detail cell in the first column. Drag LastName into the middle detail cell. Finally, drag Country in the last detail cell. Notice how SSRS creates automatic headers for you as you do this. Now that you have your simple report laid out, preview it. To do this, click the Preview tab at the top of the designer. SSRS allows you to preview the report before you deploy it to your server. This is useful so that you can find and fix any errors in your report.

The final piece of work on your report that you will do is add a little splash of color using VB .NET expressions. Go back to your design by clicking the Layout tab. You may want your rows to alternate colors so that they are easier to read. To do this, you need to make sure every even row is a different color than an odd row. SSRS supports expressions on many different properties in your reports. One such property that you ll create an expression on is the background color for your detail row in your report. Select the entire detail row by clicking the rightmost icon for the row, which should be a three bars icon. Next, in the Properties window, find the BackgroundColor property, click its drop-down list, and select <Expression >. In the Expression dialog box, paste in the following expression in the right-hand side and click OK. =iif(RowNumber(Nothing) Mod 2,"LightGreen","White")

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