SQL & PL/SQL

create table test(no int,name varchar2(25));

insert into test values(1,'aaaa');
insert into test values(2,'bbbb');
insert into test values(3,'cccc');
insert into test values(1,'dddd');
insert into test values(5,'aaaa');

delete from test where rownum=4;

0 rows deleted


i am unable to delete using rownum from the table pls help

Thanks
Rangan S