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Null values in comparison expressions

When you use a null value in an expression that contains a comparison operator,

Data Integration

produces a null value. However, you can also configure the Data Integration Server service custom property Treat Null in Comparison Operators As to tell

Data Integration

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

Use the Treat Null in Comparison Operators As custom DTM property to configure how

Data Integration

handles null values in comparison expressions. This 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

Data Integration

evaluates the expressions:

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

NULL

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Function Reference

Function Reference

Null values in comparison expressions

Null values in comparison expressions