A group above report (also called a break report) contains multiple groups in its data model. It is a "master/detail" report, where there may be a lot of information in the master group. For every master group, the related values of the detail group(s) are fetched from the database and are displayed below the master information.
For detailed examples of building various group above reports, see the following
chapters in the Oracle Reports Building Reports manual, available
on the Oracle Technology Network Oracle
Reports Documentation page (http://www.oracle.com/technology/documentation/reports.html
):
Building a Two-Query Group Report
Building an Across Break Report
Building a Wrapped Break Report
About matrix with group reports
Offsetting detail objects in a group report
Creating a multiquery group above report
Creating a matrix (cross-product) group
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