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Although Williams is known for his technical indicators, he also believes fundamentals are important Charts don t move the markets, he points out Remembering a logic class he took in college, A can t predict A Therefore, Williams says it is illogical to assume that price can predict price It s important, therefore, to understand the bigger picture What Williams did learn about indicators is that they ultimately measure human emotion It s like what Pavlov did with the salivating dogs, he says If markets move up so much, there s a point where the human mind says, Aha! I want to buy that That s the nature of how humans are wired He explains that many indicators show you what the crowd and the trend are doing The indicators are a symptom that gives you a clearer view of what s going on now I don t know if the technical indicators are that predictive, but they show you where you are If you look at price itself, that s as deceptive as a Hollywood starlet You don t know what the hell is going on So we need indicators to give us a better view of whether this is a Hollywood starlet or a real queen

Let s consider a couple of different queries, looking at which indexes are being used and which aren t. We ll look at the queries themselves, and also look at the execution plans and the metadata stored within sys.indexes and sys.dm_db_index_usage_ stats. To avoid distractions I ll use my local server, which has just had its service restarted, thereby resetting sys.dm_db_index_usage_stats. I will also use a fresh copy of the AdventureWorks sample database on SQL Server 2005. You can find AdventureWorks on the CodePlex website, with all the other samples that Microsoft makes available. It s also found on the installation DVD for SQL Server 2005 Developer Edition. I ll use the Production.Product and Production.ProductSubcategory tables. The Production.Product table has a field called ProductSubcategoryID, which acts as a foreign key to the Production.ProductSubcategory table. The ProductSubcategoryID field in Production.Product allows NULLs, to cater for those products which are not allocated to a SubCategory. Let s consider the following query:

A line-feed is the character created when you press SHIFT-RETURN A carriage return is the character created when you press RETURN

SELECT DISTINCT color FROM Production.Product;

Right at the bottom of the Editing preferences is the Show Tell Application Pop-up Menu check box This appears only in AppleScript Editor (in Snow Leopard), not in Script Editor in Leopard or earlier versions of Mac OS X Select this check box to add to the navigation bar a pop-up menu that lets you direct a tell block to the current application or a particular application Briefly, a tell block is what you use to direct a command to an application rather than to AppleScript itself; you ll start using tell blocks in the next chapter, after which you ll never stop

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This gives us ten rows, each containing a different color that is used in the Product table. The word DISTINCT ensures that no two rows are identical. If we consider its execution plan, shown in figure 4, we can clearly see how the DISTINCT operator is applied through the use of a distinct sort. We don t have an index that starts with the Color field, so the system has no better way of finding different colors than to scan through the whole table (on the Clustered Index) and then perform a distinct sort. But what if we also needed the ProductNumber of each one Let s run the query, and look at the execution plan, shown in figure 5.

We see that the Distinct Sort operator is no longer visible. We see from the execution plan (or by querying sys.dm_db_index_usage_stats) that the only index being used is the Clustered Index, and yet another index is playing an important role. We ll examine this in the next section. For now, let s consider the query in listing 1.

Often, the best way to find out which errors are likely to occur is to run a script under the wrong conditions and see what happens For example, in a script that creates a document and saves it to a folder, you may need to trap errors such as these:

SELECT s.Name, COUNT(*) FROM Production.ProductSubcategory s JOIN Production.Product p ON p.ProductSubCategoryID = s.ProductSubCategoryID GROUP BY s.Name;

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The folder doesn t exist in the file system A document of the same name is already lurking in the folder