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Grouping rows
280 DataWindow .NET
❖ To add a summary statistic:
1 Select Insert>Control>Computed Field from the menu bar.
2 Click in the Design view where you want the statistic.
The Modify Expression dialog box displays.
3 Specify the expression that defines the computed field (see below).
4 Click OK.
A shortcut to sum values
If you want to sum a numeric column, select the column in Design view and
click the Sum button in the Controls drop-down toolbar. DataWindow
Designer automatically places a computed field in the appropriate band.
Specifying the
expression
Typically, you use aggregate and other functions in your summary statistic.
DataWindow Designer lists functions you can use in the Functions box in the
Modify Expression dialog box. When you are defining a computed field in a
group header or trailer band, DataWindow Designer automatically lists forms
of the functions that reference the group:
You can paste these templates into the expression, then replace the #x that is
pasted in as the function argument with the appropriate column or expression.
For example, to count the employees in each department (group 1), specify this
expression in the group trailer band:
Count( Emp_Id for group 1 )
To get the average salary of employees in a department, specify:
Avg( Salary for group 1 )