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The manager is indeed quite content with this new feature; however, she also wants to be able to see the number of orders shipped on each date. We can supply this information by creating a view of the orders table with a GROUP BY clause, as shown in Listing 12-9. Listing 12-9. Using a GROUP BY Clause to Create a View mysql> CREATE ALGORITHM = TEMPTABLE VIEW ship_summary (date, number_of_orders) AS SELECT ship_date, count(ship_date) FROM cust_order GROUP BY ship_date; Listing 12-10 shows the output of selecting all of the fields in the ship_summary view. Listing 12-10. Output of a View with a GROUP BY Clause mysql> SELECT * FROM ship_summary; +------------+------------------+ | ship_date | number_of_orders | +------------+------------------+ | 2005-08-27 | 1 | | 2005-08-28 | 1 | | 2005-08-31 | 1 | | 2005-09-01 | 2 | | 2005-09-10 | 1 | | 2005-09-27 | 1 | +------------+------------------+ 6 rows in set (0.00 sec) The ship_summary view could easily be tweaked to further break down statistics by adding a HAVING clause to the GROUP BY statement. Just as you can when using SQL statements to get data from tables, you can add all kinds of limits to the grouped results when creating a view. For example, Listing 12-11 shows how to limit the output of the ship_summary to include only dates where one order was shipped. Listing 12-11. Using HAVING with GROUP BY to Create a View mysql> CREATE ALGORITHM = TEMPTABLE VIEW small_ship_dates (ship_date, number_of_orders) AS SELECT ship_date, count(ship_date) FROM cust_order GROUP BY ship_date HAVING count(ship_date) < 2 ORDER BY ship_date; A query of the data using the small_ship_dates view gives us a list of dates where only one order was shipped, as shown in Listing 12-12.

scale the same control by specifying both of the required transform objects for a control s RenderTransform, we get a compilation error clearly we cannot set a property to two different values at the same time. As you learned when we were exploring XNA, however, transformation matrices can be multiplied together to create a single resulting matrix that contains the effects of both of the transformations. Silverlight allows us to use exactly the same technique. This is achieved using another transformation class, TransformGroup. Instead of expecting simple numeric parameters as all the other transformation objects have, TransformGroup expects a list of transformation objects to be provided. We can therefore specify as many transforms as we need, and it will multiply them all together to create a single resulting transformation matrix, as required by UIElement. Any of the transformation objects can be specified even more TransformGroups if you need them! Remember that the order in which matrices are multiplied is significant. Rotating before a translation will cause the translation to move along the rotated axes rather than along the page s own x and y axes (and indeed, this is the benefit that TranslateTransform offers that cannot be replicated simply by changing the control s position on the screen). If you use the transformation visualization method that I described back in 6, you need to be aware that the transformation at the end of the list will apply first, working from there backward toward the start of the list. Listing 12 18 shows a TransformGroup that rotates an image by 45 degrees and translates 100 pixels along the rotated axis. Listing 12 18. Applying a ScaleTransform to an image control <Image Height="150" Stretch="Fill" Width="150" Source="/WindowsPhoneApplication1;component/Images/SmileyFace.png"> <Image.RenderTransform> <TransformGroup> <TranslateTransform X="100" /> <RotateTransform Angle="45" /> </TransformGroup> </Image.RenderTransform> </Image>

Listing 12-12. Output of a View with a HAVING Clause mysql> SELECT * FROM small_ship_dates; +------------+------------------+ | ship_date | number_of_orders | +------------+------------------+ | 2005-08-27 | 1 | | 2005-08-28 | 1 | | 2005-08-31 | 1 | | 2005-09-10 | 1 | | 2005-09-27 | 1 | +------------+------------------+ 5 rows in set (0.00 sec)

private void simulate(int maxSteps) { int step = 1; while (stepCount < maxSteps) {

Listing 2 18. Rendering a sprite using a source rectangle _spriteBatch.Draw(_radarTexture, new Vector2(100, 100), new Rectangle(_animationFrame * 75, 0, 75, 75), Color.White); Although it is not shown in Listing 2 18, it is possible to combine the use of a source rectangle with scaling and rotation because all the versions of the Draw method that allow these operations to be specified also accept a sourceRectangle parameter. In fact, we have been passing this in all the examples using these techniques, except that we passed null to indicate that we wanted the whole image to be drawn rather than a subsection.