Table of Contents


  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Access Policy transformation
  6. B2B transformation
  7. Aggregator transformation
  8. Cleanse transformation
  9. Data Masking transformation
  10. Data Services transformation
  11. Deduplicate transformation
  12. Expression transformation
  13. Filter transformation
  14. Hierarchy Builder transformation
  15. Hierarchy Parser transformation
  16. Hierarchy Processor transformation
  17. Input transformation
  18. Java transformation
  19. Java transformation API reference
  20. Joiner transformation
  21. Labeler transformation
  22. Lookup transformation
  23. Machine Learning transformation
  24. Mapplet transformation
  25. Normalizer transformation
  26. Output transformation
  27. Parse transformation
  28. Python transformation
  29. Rank transformation
  30. Router transformation
  31. Rule Specification transformation
  32. Sequence Generator transformation
  33. Sorter transformation
  34. SQL transformation
  35. Structure Parser transformation
  36. Transaction Control transformation
  37. Union transformation
  38. Velocity transformation
  39. Verifier transformation
  40. Web Services transformation



Input groups

Input groups

By default, a Union transformation has two input groups. If you want to merge data from more than two sources, add an input group for each additional source. Each group can have different field rules for each upstream transformation.
The input groups have the following characteristics:
  • The Union transformation initializes its output fields based on fields in the first source that you connect to an input group.
  • Each input group can use a different field mapping mode or parameter.
  • You can parameterize the field mappings or define the field mapping for each input group.
To add an input group, in the Mapping Designer, connect an upstream transformation to the "New Group" group of the Union transformation. You can also add input groups on the
Incoming Fields
tab of the Union transformation.
You can rename input groups. You can also delete input groups as long as there are at least two remaining input groups. Rename and delete input groups on the
Incoming Fields


We’d like to hear from you!
Data Integration - December 20, 2023

How can I delete one input from an IICS union transformation and leave the ones I still need? 

Informatica Documentation Team - January 06, 2024

Hi Data Integration,

Thanks for reaching out. You can delete an input group on the Incoming Fields tab of the Union transformation. To do this, select the Incoming Fields tab and locate the input group that you want to delete. When you hover the mouse over the input group name, a delete (trash can) icon appears on the right side in the same row as the input group name. Click the delete icon.

Note that a Union transformation needs to have at least two input groups. So, when the transformation has only two input groups, the delete icon doesn't appear when you hover over the input group name.

Hope that helps!