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Eclipse BIRT Report Developer Guide
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Aggregating Data

One of the key features of any report is the ability to display summary, or aggregate, information. For example, a sales report can show the overall sales total; sales subtotals by product type, region, or sales representatives; average sales figures; or the highest and lowest sales figures.

Aggregating data involves performing a calculation on a set of values rather than on a single value. For a simple listing report, aggregate calculations are performed on values in a specific field, over all the data rows in the report.

For example, BIRT calculates an average payment in a report by adding the values in the Amount field in every row, then dividing the total by the number of rows.

(c) Copyright Actuate Corporation 2009

  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire