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Creating Custom Functions
Custom Function API Reference

Transformation Language Reference

10.4.0
- 10.5.6
- 10.5.1
- 10.5

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Null Values in Comparison Expressions

When you use a null value in an expression containing a comparison operator, the

PowerCenter Integration Service

produces a null value. However, you can also configure the

PowerCenter Integration Service

to treat null values as high or low in comparison operations.

Use the Treat Null In Comparison Operators As property to configure how the

PowerCenter Integration Service

handles null values in comparison expressions.

This

PowerCenter Integration Service

configuration property affects the behavior of the following comparison operators in expressions:

=, !=, ^=, <>, >, >=, <, <=

For example, consider the following expressions:

NULL > 1 
NULL = NULL

The following table describes how the

PowerCenter Integration Service

evaluates the expressions:

Expression	Treat Null in Comparison Operators As
Expression	NULL	HIGH	LOW
NULL > 1	NULL	TRUE	FALSE
NULL = NULL	NULL	TRUE	TRUE

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Transformation Language Reference

Transformation Language Reference

Null Values in Comparison Expressions

Null Values in Comparison Expressions