isNull evaluates an expression to see if it is null. If the
expression is null, isNull returns true, and otherwise it returns
false.
Syntax
isNull(expression)
Arguments
- expression
-
The expression to be evaluated as null or not. It can be a field name like
address1or a call to another function that outputs a string.
Return type
Boolean
Example
The following example evaluates the sales_amount field for null values.
isNull(salesAmount)
The following are the given field values.
20.13
(null)
57.54For these field values, the following values are returned.
false
true
falseThe following example tests for a NULL value in an ifelse
statement, and returns a human-readable value instead.
ifelse( isNull({ActiveFlag}) , 'Inactive', 'Active') 