- In Expression Builder, under Category, select BIRT Functions.
Sub-Category displays the classes of functions defined by BIRT.
- Select Total.
Expression Builder displays the aggregate functions.
- Double-click the aggregate function you want to use.
The function appears in the expression area of Expression Builder.
- Within the parenthesis, ( ), of the function, specify the data set field whose values you want to aggregate:
- Under Category, choose Available Data Sets.
- Under Sub-Category, choose the data set that contains the field.
- Double-click the field to insert it between the parenthesis, ( ), of the aggregate function.