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BIRT: A Field Guide to Reporting by Nola Hague, Alethea Hannemann, Diana Peh

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Chapter 13. 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 over a set of data rows. For a simple listing report, the aggregate calculations are performed over all the data rows in the report. The listing report in Figure 13-1 displays aggregate data at the end of the report.

A simple listing report that displays detail and aggregate data

Figure 13-1. A simple listing report that displays detail and aggregate ...

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