When you create a report, you are not restricted to the fields that exist in your data source. If you can generate the information you want from the existing data, you can create a temporary field to evaluate and display it. A temporary field takes up no storage space in the data source since it is created only when needed.
Note: The concept of creating temporary fields is described in Creating Temporary Fields, in the Creating Reporting Applications With Developer Studio manual. This topic describes how to create temporary fields with Report Painter.