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

Aggregate Expressions

Aggregate Expressions

The Designer allows aggregate expressions only in the Aggregator transformation. An aggregate expression can include conditional clauses and nonaggregate functions. The expression can also include one aggregate function within another aggregate function, such as:
MAX( COUNT( ITEM ))
The result of an aggregate expression varies based on the group by ports in the transformation. For example, when the Integration Service calculates the following aggregate expression with no group by ports defined, it finds the total quantity of items sold:
SUM( QUANTITY )
However, if you use the same expression, and you group by the ITEM port, the Integration Service returns the total quantity of items sold, by item.
You can create an aggregate expression in any output port and use multiple aggregate ports in a transformation.

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