Answer Posted / ajay

Yes, it is possible here are the examples

create or replace function funbool(b varchar2)
return boolean
as
begin
If b is not null then
return true;
else
return false;
end if;
end;

create or replace function funbool(b varchar2)
return number
is
begin
if b is null then
Dbms_output.put_line( 'false');
else
Dbms_output.put_line( 'true');
end if;
Return b;
end;

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