Transformations > Filter transformation > Filter conditions

Filter conditions

The filter condition is an expression that returns TRUE or FALSE.
You can create one or more simple filter conditions. A simple filter condition includes a field name, operator, and value. For example, Sales > 0 retains rows where all sales values are greater than zero.
Filter conditions are case sensitive. You can use the following operators in a simple filter:
When you define more than one simple filter condition, the mapping task evaluates the conditions in the order that you specify. The task evaluates the filter conditions using the AND logical operator to join the conditions. The task returns rows that match all of the filter conditions.
You can use an advanced filter condition to define a complex filter condition. When you configure an advanced filter condition, you can incorporate multiple conditions using the AND or OR logical operators. You can use a constant to represent condition results: 0 is the equivalent of FALSE, and any non-zero value is the equivalent of TRUE.
When you change the filter condition type from simple to advanced, the Mapping Designer includes configured simple filter conditions in the advanced filter condition. You can use or delete the simple filter conditions. The conversion does not include parameters.
To filter rows that contain null values, use the ISNULL function to test the value of the field. To filter rows that contain spaces, use IS_SPACES.
For example, if you want to filter out rows that contain a null value in the First_Name field, use the following condition: IIF(ISNULL(First_Name),FALSE,TRUE). The condition states that if the First_Name field is NULL, the return value is FALSE. The mapping task discards the row. Otherwise, the row passes through to the next transformation.