what's the different about the following cmds?
1.
create table aaa ( a1 int )
on 'seg_test'
partition by roundrobin 1 on ( 'seg_test')
2.
create table bbb ( a1 int )
on 'default'
3.
create table ccc ( a1 int )
on 'default'
partition by roundrobin 1 on ('seg_test')
the 1st and 2nd is clear, but what happne if I create table using 3rd cmd?