About calculated data
Most BIRT reports require calculations to track sales, finances, inventory, and other critical business activities. You can use Interactive Viewer to create calculations to count items in a warehouse or provide more complex financial data, such as tracking stock portfolio performance over time.
To display calculated data in a report, you create a computed column, such as the Total column shown in the report in Figure 5-1. In the following example, you need to calculate the Total because the original report does not provide this data.
Figure 5-1 Report with computed column