A nullable field is a field defined as eligible to receive null values. The initial value, if not specified, is the null value. Fields in working data, parameter data, panels, and dataviews defined through SQL can be nullable.
The null value is an unknown value. CA Ideal maintains a nullable field as a single field with a null value indicator.
You can assign a null value only to a null‑eligible field.
You cannot redefine nullable fields or groups that contain subordinate nullable fields. Groups that contain subordinate nullable fields are restricted
Null values display as question marks (?) in reports.
Panel fields with null values are treated as empty ($EMPTY is true). Null values display as question marks (?) in panels.
You can use nullable fields in built‑in functions, except as the arguments for keyword parameters, such as "START=n" in $SUBSTR.
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