Extracting every nth row

Extracting every nth row

Scenario: How to load every nth row from a Flat file/ relational DB to the target? Suppose n=3, then in above condition the row numbered 3,6,9,12,....so on, This example takes every 3 row to target table.

Solution:

1. Connect an expression transformation after source qualifier.
   Add the next value port of sequence generator to expression transformation.
   
2. In expression create a new port (validate) and write the expression like in the picture below.
   
3. Connect a filter transformation to expression and write the condition in property like in the picture below.
   
4. Finally connect to target.