Aggregation
BIRT 2.5 now has a really nice Aggregation visual component.
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In the previous versions of BIRT, aggregations were expressions that one would put into the Expression Builder using the Data component. This has changed in newer versions of BIRT to use a simple graphical component that gets displayed visually, and adds in a list of aggregations that are available to the user. This subject will be covered in detail in Chapter 5,