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O Neil has often told investors to create a set of rules before entering the market It s not enough to recognize which stocks to buy and when to buy them, he cautions You must also have a set of sell rules to nail down worthwhile gains once you have them, and even more important, a set of sell rules to cut short all mistakes In fact, O Neil is famously known for telling investors to cut losses at 8 percent from the price they paid for the stock That s the only way to avoid 30 to 50 percent losses that can easily occur to any new or experienced investor, he says You can t sit with mistakes; you have to learn to read the market and listen to it, and not fight the reality of the market, which can be costly

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To reposition a window without resizing it, set the left position property and the top property to suitable pixel values For example, the following tell block makes Excel position the upper-left corner of the front window 600 pixels from the left edge of the screen and 300 pixels from the top edge:

In the inner CATCH block I m checking whether we generated error number 8134 (divide by zero) and if so, I print a message. For every other error message, I reraise or rethrow the error to the outer catch block. Note the text string that s added to

William J O Neil, at age 30 in the 1960s, became the youngest person at that time to buy a seat on the New York Stock Exchange O Neil was one of the first to use computers to analyze performance variables, and he pioneered landmark research that identified seven performance traits of the greatest market leaders before they make their biggest price gains His research became the basis of the CAN SLIM Investment System O Neil launched Investor s Business Daily (IBD) in 1984, followed by the award-winning Web site, Investorscom He is the author of numerous bestselling books, including the international classic How to Make Money in Stocks: A Winning System in Good Times or Bad (over 2 million copies sold) Stock Trader s Almanac dedicated its thirty-seventh edition to O Neil WHAT S NEXT

the error message variable. The %d is a placeholder that s replaced by the first additional parameter passed to RAISERROR, which is @ErrorNumber in my example. Books Online has more information on the different types of replace variables that can be used in RAISERROR. The error functions can be used in any stored procedure called from inside the CATCH block. This allows you to create standardized error-handling modules such as the one in listing 8.

tell the application id "commicrosoftExcel" set left position of front window to 600 set top of front window to 300 end tell

CREATE PROCEDURE ErrorHandler AS BEGIN PRINT 'I should log this error:' PRINT ERROR_MESSAGE() END GO BEGIN TRY SELECT 1/0 END TRY BEGIN CATCH EXEC ErrorHandler END CATCH

The next chapter goes into more depth about the mysterious but game-changing use of high-frequency trading (HFT)

This block of code will return the following results:

To rearrange the open Excel windows, use the arrange_windows command Without any parameters, this command tiles all visible windows, giving each as equal a share of the screen space as possible But you can also use the following parameters, all of which are optional:

Locks are a very important part of SQL Server to understand. They allow multiple users to use the same resources without stomping on each other, and if you don t understand them, your job of tuning the server is going to be a lot harder. For many people, the seemingly logical way to get around the problem of locks is to ignore them by using one of these methods: Using SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED to have all following code neither set nor respect locks Using locking hints of NOLOCK or READUNCOMMITTED on tables in queries But both of these methods open up more complicated problems for your support status. By ignoring locks, you will get rows that are in the middle of being processed, and they may not be in their final resting place. This means that you may be getting data that was never committed to the database, or data that is in an intermediate state.