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Cumulative aggregations accumulate data from the first element within the sequence up to the current point. For example, imagine the following request: for each employee and month, return the total quantity and average monthly quantity from the beginning of the employee's activity to the month in question. Recall the preSQL Server 2005 set-based techniques for calculating row numbers; using these techniques, you scan the same rows we need to scan now to calculate the total quantities. The difference is that for row numbers you used the aggregate COUNT, and here you're asked for the SUM and the AVG. I demonstrated two solutions to calculate row numbersone using subqueries and one using joins. In the solution using joins, I applied what I called an expand-collapse technique. To me, the subquery solution is much more intuitive than the join solution, with its artificial expandcollapse technique. So, when there's no performance difference, I'd rather use subqueries. Typically, you won't see a performance difference when only one aggregate is involved, as the plans would be similar. However, when you request multiple aggregates, the subquery solution might result in a plan that scans the data separately for each aggregate. Compare this to the plan for the join solution, which typically calculates all aggregates during a single scan of the source data. So my choice is usually simpleuse a subquery for one aggregate, and a join for multiple aggregates. The following query applies the expand-collapse approach to produce the desired result, which is shown in abbreviated form in Table 6-4: SELECT O1.empid, CONVERT(VARCHAR(7), O1.ordmonth, 121) AS ordmonth, O1.qty AS qtythismonth, SUM(O2.qty) AS totalqty, CAST(AVG(1.*O2.qty) AS DECIMAL(12, 2)) AS avgqty FROM dbo.EmpOrders AS O1 JOIN dbo.EmpOrders AS O2 ON O2.empid = O1.empid AND O2.ordmonth <= O1.ordmonth GROUP BY O1.empid, O1.ordmonth, O1.qty ORDER BY O1.empid, O1.ordmonth;

Table 6-4. Cumulative Aggregates Per Employee, Month (Abbreviated)

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XAML <DataStateBehavior Binding="{Binding IsChecked, ElementName= ShowAsListButton}" TrueState="ShowAsList" FalseState="ShowAsIcons"/>

empid ordmonth qtythismonth totalqty avgqty 1 1 1 1 1 1 1 1 1 1996-07 1996-08 1996-09 1996-10 1996-11 1996-12 1997-01 1997-02 1997-03 121 247 255 143 318 536 304 168 275 121 368 623 766 1084 1620 1924 2092 2367 121.00 184.00 207.67 191.50 216.80 270.00 274.86 261.50 263.00

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Page 45 Speaking Clearly Speaking clearly is one of the most important tasks for the presenter After all, the presenter s words provide important information to the presentation s audience As a presenter, it is sometimes difficult to keep this in mind because so many things are going on simultaneously while recording However, speaking at an even pace and constantly remembering to enunciate is crucial to the presenter s effectiveness in communicating However, the presenter should realize that his or her recorded words and performance can be edited in Microsoft Producer This can help reassure the presenter that timing does not have to be perfect If the presenter s timing is off, the recording can be easily synchronized in the presentation using Microsoft Producer.

empid ordmonth qtythismonth totalqty avgqty 1 ... 2 2 2 2 2 2 2 2 2 2 ... 1997-04 ... 1996-07 1996-08 1996-09 1996-10 1996-11 1996-12 1997-01 1997-02 1997-03 1997-04 ... 20 ... 50 94 137 248 237 319 230 36 151 468 ... 2387 ... 50 144 281 529 766 1085 1315 1351 1502 1970 ... 238.70 ... 50.00 72.00 93.67 132.25 153.20 180.83 187.86 168.88 166.89 197.00 ...

Now let's say that you were asked to return only one aggregate (say, total quantity). You can safely use the subquery approach: SELECT O1.empid, CONVERT(VARCHAR(7), O1.ordmonth, 121) AS ordmonth, O1.qty AS qtythismonth, (SELECT SUM(O2.qty) FROM dbo.EmpOrders AS O2 WHERE O2.empid = O1.empid AND O2.ordmonth <= O1.ordmonth) AS totalqty FROM dbo.EmpOrders AS O1 GROUP BY O1.empid, O1.ordmonth, O1.qty;

As the user clicks the Contacts or Avatar radio buttons, the visual state is toggled between the ShowAsList visual state and the ShowAsIcons visual state. The flip transition animation between these states is also defined by the visual state manager. Another example of this style of navigation is shown in the State-Based Navigation QuickStart application when the user switches to the details views for the currently selected contact. The following illustration shows an example of this.

Because of this, it is often easier to videotape the speaker s words (using a digital or analog video camera), record the video into Microsoft Producer, and later edit the video in Microsoft Producer If you are using a Web camera, you can easily use Microsoft Producer to make a live recording using Microsoft Producer, and then edit and synchronize the recorded video with slides in Microsoft Producer as well Synchronizing your presentation and editing video are discussed in part III of this book Being Dynamic when Speaking By displaying enthusiasm in his or her voice to create emphasis on important points, the presenter can convey interest in the subject to the audience Think about times when you have seen speakers talking monotonously with no visible passion or interest in what they are speaking about.

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