create table t1(
	a number,
	b number
)
/

insert into t1(a, b)
values (1, 2)
/

commit
/

with
function udf(
	x t1%rowtype)
	return number
as
begin
	return ora_hash(x.a || ' ' || x.b);
end;
select udf(?)
	from t1
/