Table of Contents

Search

  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

Constant Expressions

Constant Expressions

A constant expression is any expression that uses transformation functions (except aggregate functions) to write constant expressions. You cannot use values from input, input/output, or variable ports in a constant expression.
Some valid constant expressions include:
500 * 1.75 TO_DATE('January 1, 1998, 12:05 AM','MONTH DD, YYYY, HH:MI AM') ERROR ('Null not allowed') ABORT('Null not allowed') SESSSTARTTIME
You cannot use values from ports within the expression because the Integration Service assigns default values for the entire mapping when it initializes the session.
The following examples are not valid because they use values from ports:
AVG(IN_SALARY) IN_PRICE * IN_QUANTITY :LKP(LKP_DATES, DATE_SHIPPED)
You cannot call a stored procedure or lookup table from a default value expression.

0 COMMENTS

We’d like to hear from you!