This partitioning strategy is random as no partitioning criteria are used. Round-robin-partitioned tables have no partition keys.
create table currentpublishers (pub_id char(4) not null, pub_name varchar(40) null, city varchar(20) null, state char(2) null) partition by roundrobin 3 on (seg1)
All partition-aware utilities and administrative tasks are available for round-robin partitioned tables—whether or not semantic partitioning has been licensed or configured.