SQL> create table t ( x int primary key , y int )
  2  organization index
  3  partition by hash ( x ) partitions 8;

Table created.

SQL> create table t ( x int primary key , y int )
  2  organization index
  3  partition by range ( x )
  4  ( partition p1 values less than (1000),
  5    partition p2 values less than (maxvalue));

Table created.