-- zad 3
select sqrt(power(12.34,2)+power(77,1/3)),round(sqrt(power(12.34,2)+power(77,1/3))),trunc(sqrt(power(12.34,2)+power(77,1/3)))
,ceil(sqrt(power(12.34,2)+power(77,1/3))),floor(sqrt(power(12.34,2)+power(77,1/3)))
from dual;
-- zad 5
select sysdate+321,sysdate-321,floor(months_between(sysdate+321,sysdate-321)),trunc((sysdate+321)-(sysdate-321)/7) from dual;
-- zad 7
select (timestamp' 2018-12-12 19:07:00'-timestamp'2015-02-15 22:04:19')year to month from dual;
-- zad 11
select to_char(last_day(sysdate),'DAY D DD DDD W WW MONTH YYYY year') from dual;
-- zad 15
select to_number(concat('987','654'))-123456 from dual;
-- zad 16
select  to_char(to_char(sysdate,'CC'),'RN') from dual;