The GroupFooter band is commonly used to generate a group footer which is placed after the Data band bound to the group and typically contains components that output summary information relating to the group content. Every GroupFooter band belongs to the GroupHeader band associated with it, and will not be output if there is no associated GroupHeader band.
Note.
The GroupFooter
band is always output
before the Footer
band regardless of where
bands may be positioned on a page.
The GroupFooter band is used to output information specific to each group. For example, if you want to output the number of rows in a group, it is enough to put a text component on the GroupFooter band and assign it the following expression:
{Count()}