Group Null and NIL

Returns the first non NIL/NULL expression among its arguments.

Coalesce( <Expression,...> ) --> <Expression>

Returns the first non empty expression among its arguments.

CoalesceEmpty( <Expression,...> ) --> <Expression>

Toggles NULL/NIL value support of a work area

DbSetNullValue([<lNullAllowed>]) -> lNullAllowed

Tests if an expression evaluates to NULL/NIL.

IsNull( <Expression> ) --> lIsNull IsNull( <Expression>, <ReplacementValue> ) --> xValue

Returns a NIL/NULL value if the two specified expression values are equivalent

NullIf( <Expression>, <Expression> ) --> lEqual

Enables/Disables NULL/NIL values for fields

SET NULLVALUE ON | off | <lToggle>