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Why is modifying ETL processes so challenging For one thing, any modifications usually require retesting the ETL. When you are dealing with hundreds of gigabytes or terabytes of data, that can be very time consuming. Also, any changes to the business rules in the ETL can impact historical data already in the warehouse. Determining whether to update historical information, or just change it moving forward, is a major decision in itself. If you do want to make changes to historical data, determining how to apply these updates can be complicated and typically involves multiple groups in the company (IT and any impacted business units) coming together to agree on an approach.

Some traders think that as soon as RSI touches overbought or oversold territory, the stock or index might reverse It s understandable why: After all, it takes strength for a security to become overbought and it takes weakness to become oversold As mentioned previously, pay attention but don t expect an immediate reversal Also, depending on market conditions, don t get fixated on the 70 and 30 levels, as these may change depending on market

Within a workbook, the worksheet class represents a worksheet Excel groups the worksheet objects together into the worksheets list This collection works as usual, but you have to bear in mind that Excel also has chart sheets (discussed next), list sheets, macro sheets, and dialog sheets and all these appear in another collection, sheets The chart sheet object represents a chart sheet (a chart on its own sheet not a chart on a worksheet) Excel groups the chart sheet objects with the worksheet objects in the sheets list The active sheet object represents the active sheet in the active workbook As in most applications, the window object represents an open window All the window objects together make up the windows list

Now that we ve discussed why data profiling is a good idea, let s move on to the data profiling capabilities in SQL Server 2008.

The Data Profiling task is new for SSIS 2008. It has the capability to create multiple types of data profiles across any target tables you specify. Using it can be as simple as adding it to a package, selecting a SQL Server table, and picking one or more profiles to run against that table. Each profile returns a different set of information about the data in the target table. First, we ll cover the types of profiles that can be created, and then how you can work with them.

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To launch Excel, use the launch command, followed by the activate command if you want to bring Excel to the front so that you can see what s happening often useful when you re developing your scripts or when you want the user to see what the script does For example:

The Data Profiling task supports eight different profiles. Five of these look at individual columns in a table, two of them look at multiple columns in the same table, and one looks at columns across two tables. A specific data profile works with specific data types (with some exceptions, which will be pointed out). In general, though, profiles work with some combination of string (char, nchar, varchar, nvarchar), integer (bit, tinyint, smallint, int, bigint), or date (datetime, smalldatetime, timestamp, date, time, datetime2, datetimeoffset) column data types. Most profiles do not work with binary types (such as text or image) or with non-integer numeric data.

The Column Length Distribution profile provides the minimum and maximum lengths of values in a string column, along with a list of the distinct lengths of all values in the column and a count of rows that have that distinct length. For example, profiling a telephone number column (for U.S. domestic telephone numbers) where you expect numbers to be stored with no formatting should produce one value a distinct length of 10. If any other values are reported, it indicates problems in the data.

If you prefer, you can omit the launch command the activate command on its own will launch Excel if it s not already running But your code will be clearer if you include launch if you re intending to launch the application If the application is running already, using launch doesn t return an error