Table of Contents

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  1. Preface
  2. Working with Transformations
  3. Aggregator Transformation
  4. Custom Transformation
  5. Custom Transformation Functions
  6. Data Masking Transformation
  7. Data Masking Examples
  8. Expression Transformation
  9. External Procedure Transformation
  10. Filter Transformation
  11. HTTP Transformation
  12. Identity Resolution Transformation
  13. Java Transformation
  14. Java Transformation API Reference
  15. Java Expressions
  16. Java Transformation Example
  17. Joiner Transformation
  18. Lookup Transformation
  19. Lookup Caches
  20. Dynamic Lookup Cache
  21. Normalizer Transformation
  22. Rank Transformation
  23. Router Transformation
  24. Sequence Generator Transformation
  25. Sorter Transformation
  26. Source Qualifier Transformation
  27. SQL Transformation
  28. Using the SQL Transformation in a Mapping
  29. Stored Procedure Transformation
  30. Transaction Control Transformation
  31. Union Transformation
  32. Unstructured Data Transformation
  33. Update Strategy Transformation
  34. XML Transformations

Transformation Guide

Transformation Guide

Expression Transformation Overview

Expression Transformation Overview

Use the Expression transformation to calculate values in a single row. For example, you might need to adjust employee salaries, concatenate first and last names, or convert strings to numbers. You can also use the Expression transformation to test conditional statements before you pass the results to a target or other transformations. The Expression transformation is a passive transformation.
Use the Expression transformation to perform non-aggregate calculations. To perform calculations involving multiple rows, such as sums or averages, use the Aggregator transformation.
The following figure shows a simple mapping with an Expression transformation used to concatenate the first and last names of employees from the EMPLOYEES table:
The mapping contains a source, a source qualifer, an Expression transformation, and a target. The Expression transformation is open to show port names and expressions. The source, source qualifier, and target are iconized.
You can evaluate expressions that you configure in the Expression Editor.

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