Testing for a null
Use this property to check if the column serial number contains a null.
You want to test column serialno to see if it contains a null. If it does, you want to write the corresponding records to the output link.
You enter the following in the Where property:
serialno is null
In this example the stage only has one output link. You do not need to specify the Output Link property because the stage will write to the output link by default.