You can enter any expression that returns a single value. You can also specify a constant for the condition. A group filter condition returns TRUE or FALSE for each row that passes through the transformation, based on whether a row satisfies the specified condition. Zero (0) is the equivalent of FALSE. Any non-zero value is the equivalent of TRUE. You can use a single numeric port as a filter condition. The Data Integration Service passes the rows of data that evaluate to TRUE to each transformation or target that is associated with each user-defined group.

For example, you have customers from nine countries, and you want to perform different calculations on the data from three countries. You can use a Router transformation in a mapping to filter this data to three different Expression transformations.

You can use parameters as elements in the group filter condition. You can use system parameters or user-defined parameters. You can create parameters from the Expression Editor and add them to the expression.

The default group does not have a group filter condition. However, you can create an Expression transformation to perform a calculation based on the data from the other six countries.

The following figure shows a mapping with a Router transformation that filters data based on multiple conditions:

To perform multiple calculations based on the data from three different countries, create three user-defined groups and specify three group filter conditions on the

Groups

tab.

The following figure shows group filter conditions that filter customer data:

The following table shows group filter conditions that filter customer data:

In the mapping, the Data Integration Service passes the rows of data that evaluate to TRUE to each transformation or target associated with each user-defined group, such as Japan, France, and USA. The Data Integration Service passes the row to the default group if all of the conditions evaluate to FALSE. The Data Integration Service then passes the data of the other six countries to the transformation or target that is associated with the default group. If you want the Data Integration Service to drop all rows in the default group, do not connect it to a transformation or a target in a mapping.

The Router transformation passes data through each group that meets the condition. If data meets three output group conditions, the Router transformation passes the data through three output groups.

For example, you configure the following group conditions in a Router transformation:

When the Router transformation processes an input row data with employee_salary=3000, it routes the data through output groups 1 and 2.