Thursday 11 October 2012

Union transformation in Informatica

What is Union Transformation ??
  • A Union transformation has multiple input groups and one output group.
  • Union transformation. equivalent to UNION ALL in SQL
  • Union transformation does not remove duplicate rows
  • Output and input ports can be created manually or passed from another transformation
  • Cannot use a Sequence Generator or Update Strategy transformation upstream from a Union transformation.
Components of Union Transformation
  1. Transformation tab: To rename the transformation and give a description.
  2. Properties tab: You can specify the tracing level.
  3. Groups tab: For creating and removing groups
  4. Group Ports tab: For creating and removing ports of groups.

Union Transformation
Things to Remember
  • Number of ports in the entire input group should be the same. If you connect all ports in one input group, but do not connect a port in another input group, the Integration Service passes NULLs to the unconnected port.
  • When you add a Union transformation to a mapping, you must verify that you connect the same ports in all input groups. If you connect all ports in one input group, but do not connect a port in another input group, the Integration Service passes NULLs to the unconnected port.

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