Understanding Repository
The repository structure, shown in Figure 5-5, displays the databases, their tables, and columns. Use Repository to drag and drop column definitions when you create filters in transformation instructions.
Figure 5-5  
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Displays a list of the derived columns in the selected database, as shown in Figure 5-6.
Figure 5-6  
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Typically, analysts create derived (calculated) columns during the data analysis. BIRT Loader administrators have to add these columns to the tables when refreshing the data during the load process. Otherwise, the definitions of these columns are lost, and must be recreated. To add the definitions to a script, copy instructions from the list and paste them to the script in Main file.

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