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Once change tracking is enabled, what an application can do is connect to the database, and determine the current baseline version of the table. This is a BIGINT value that is returned by calling the new function CHANGE_TRACKING_CURRENT_ VERSION() (this represents the most recent committed transaction). Once the application knows this value, it can load all of the data from the table, and then can check for further updates later using the CHANGETABLE() function. This function will return a set of data representing any rows that have changed in the specified table since the baseline version retrieved above. The following is all in T-SQL, but you can envision how an application would use the same logic. Open two new query windows in Management Studio, connected to the HR database, and run the code in listing 8.

When you connect to the Internet via a different connection than your regular ISP, you may need to use a different SMTP server in order to send mail To change the SMTP server, set the smtp server property of the account Here s an example that retrieves

SET TRANSACTION ISOLATION LEVEL SNAPSHOT; -- Check the current baseline: SELECT Baseline = CHANGE_TRACKING_CURRENT_VERSION(); -- Load the current version of the table: SELECT EmployeeID, FirstName, LastName, Salary FROM dbo.Employees; -- Now, switch to the second query window, and make some updates to the table: UPDATE dbo.Employees SET LastName = 'Kinison' WHERE EmployeeID = 2; DELETE dbo.Employees WHERE EmployeeID = 5; INSERT dbo.Employees ( EmployeeID, FirstName, LastName, Salary ) SELECT 6, 'Kirby', 'Quigley', 62500;

one of the drop-down menus, select MACD, and press the Update button) 3 If you scroll back up a little, under Range, click on the drop-down menu You can change the time period in the range from 1 month to 3 years 4 Click the Update button to save the changes 5 Advanced hint: When you are ready, choose the MACD Histogram indicator under the Indicators drop-down menu This gives you a visual representation of MACD momentum More information about the histogram follows For Short-Term Traders: Digging a Little Deeper One of the reasons that MACD is so popular with traders is that it combines the attributes of two indicators into one (trend-following and momentum) Technically, the MACD line is actually the difference between the closing prices of the first two exponential moving averages, usually the 12- and 26-day (the 12-day less the 26-day exponential moving average is the MACD line) As mentioned earlier, the 9-day signal line is a moving average of the MACD line Short-term traders may want to change the default settings to (6,19,9), as Appel suggested in his book Power Tools for Active Investors In addition to buying or selling on crossovers, you may also want to pay attention when MACD crosses above or below the zero line Appel says these signals tend to be very reliable when buying or selling Another choice for traders is the MACD histogram (you can find it on the drop-down menu on any chart program), developed by Thomas Aspray The histogram is similar to MACD but gives you a visual representation of momentum in graphical form Histograms look like mountain ranges As the peaks and valleys get smaller, momentum is slowing down, which could signal a change in direction As the peaks and valleys get taller and deeper, momentum may be increasing It might also be signaling a possible divergence.

the smtp server object from the account named Roving, stores it in a variable named TravelServ, and then applies the contents of that variable as the smtp server for the account named Main Mail:

Listing 9 shows the code to retrieve the changes made to the Employees table. Replace <x> with the result from the baseline query in listing 8.

SELECT NewBaseLine = CHANGE_TRACKING_CURRENT_VERSION(), cv = SYS_CHANGE_VERSION, ccv = SYS_CHANGE_CREATION_VERSION, op = SYS_CHANGE_OPERATION, EmployeeID FROM CHANGETABLE(CHANGES dbo.Employees, <x>) AS ChT;

set TravelServ to the smtp server of account "Roving" tell the account "Main Mail" set the smtp server to TravelServ end tell

have learned Finally, this section is loaded with important resources such as where to get help, additional charts, backtest ideas, and a glossary of indicators Suggestion: Like most of my books, it will seem short, but it s packed with information Therefore, it s probably best to go slowly and try not to learn all of the indicators in only one reading That being said, I set up the book so you can start immediately

The results should look something like this: