можно и вниз , но тока его функции
Constant Value Description
jgexAggregateNone
0 Default. Displays nothing in the group footer.
jgexCount
1 Displays the count of records in a group.
jgexSum
2 Displays the sum of values in a group for the column.
jgexAvg
3 Displays the average of the values in a group for the column.
jgexMin
4 Displays the minimum value in a group for the column.
jgexMax
5 Displays the maximum value in a group for the column.
jgexStdDev
6 Displays the standard deviation in a group for the column.
jgexValueCount
7 Displays the count of record with non-null values in a group for the column.