DECLARE
v_letiste number;
BEGIN
select airports into v_letiste
from wf_countries
where country_name='Navassa Island';
CASE
when v_letiste <=100 then dbms_output.put_line('There are 100 nebo min letist');
when v_letiste between 101 and 1000 then dbms_output.put_line('There are 101 az 1000 letist');
when v_letiste between 1001 and 10000 then dbms_output.put_line('There are 1001 az 10k letist');
when v_letiste >10000 then dbms_output.put_line('There are vic jak 10k');
ELSE dbms_output.put_line('There are 0 letist');
END CASE;
END;