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This is far less useful, but I want to demonstrate the power of the query optimizer, so that you can better appreciate it and design your queries accordingly. In figure 4, notice the query plan that is being used when querying dbo.ProductsPlus3. This time, when we query only the Name and ProductID fields, the query optimizer does not simplify out the Production.ProductSubcategory table. To find out why, let s look at the four JOIN uses. No additional columns are being used from that table. The FULL JOIN prevents any elimination.No duplication is being created as the ProductSubcategoryID field is still unique in the second table. But the other use of a JOIN the potential addition of NULL rows could apply. In this particular case we have no empty subcategories and no rows are added, but the system must still perform the JOIN to satisfy this scenario.

(continued)

Another way to ensure that NULL rows do not appear in the results of a query would be to use a WHERE clause:

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SELECT ProductID, Name FROM dbo.ProductsPlus3 WHERE NOT ProductID IS NULL;

And now once more our execution plan has been simplified into a single-table query as shown in figure 5. The system detects that this particular use for a JOIN is made redundant regardless of whether it is being negated within the view or within the outer query. After all, we ve already seen that the system treats a view as a subquery. Regardless of what mechanism is stopping the JOIN from being used, the optimizer will be able to remove it from the execution plan if it is redundant.

On the other hand, he says, when people don t like something, they make one quick decision to sell And that s why declines are a lot sharper than advances, he explains It s just one decision to sell, whereas buying occurs in increments When you follow the trend, DeMark points out, it doesn t matter which moving average indicator you use: they will all work, and so will any trend-following indicator But when a market is in a trading range a more challenging market you have to turn to oscillators, especially those that can tell you when the market will break out or reverse During those times, DeMark attempts to identify divergences, which he says work when the market is in a trading range The reason market oscillators conform to divergences sometimes, not all the time, is because of duration, the amount of time which an indicator resides in an overbought or oversold condition If it s overbought for more than seven bars, then you are extremely overbought If you re there for less than seven bars, you are mildly overbought The market will top when you are mildly overbought or oversold If you are extremely overbought or oversold, the markets are in a trend, and you re smarter not to do anything or go with the flow of the trend He also measures supply and demand Supply and demand drives the market, so we try and measure when supply and demand are exhausted If the market exhausts itself, typically the market will go sideways The internal aspects of the market will forewarn us that it is just a respite or decline And when markets rally, DeMark says, it s not because of smart buyers at the bottom but because the last seller has sold And conversely, highs are not made because of smart sellers but because the last buyer has bought.

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Although this may all seem like an academic exercise, there are important takeaways. If the optimizer can eliminate tables from your queries, then you may see significant performance improvement. Recently I spent some time with a client who had a view that involved many tables, each with many columns. The view used OUTER JOINs, but investigation showed that the underlying tables did not have unique constraints on the columns involved in the JOINs. Changing this meant that the system could eliminate many more tables from the queries, and performance increased by orders of magnitude.

Summary

(*Start a tell block to the Finder Open a window to the Documents folder Set the view to Column view *) tell the application "Finder" open folder "Documents" of home set position of Finder window 1 to {1, 44} set bounds of Finder window 1 to {1, 44, 800, 605} set current view of Finder window 1 to column view set target of Finder window 1 to folder "Applications" of startup disk end tell

DeMark explains there are three levels of chart analysis, which is what most technical indicators are based on The first level I call chartists, or chart artists, DeMark says They try to predict the future based on a chart without tools Their biases and predispositions dictate what their conclusions are