create index oe.cust_zip_cd_ix on oe.cust(zip_cd)
 global partition by hash(zip_cd)
  (partition z1      tablespace idx_1,
   partition z2      tablespace idx_2,
   partition z3      tablespace idx_3,
   partition z4      tablespace idx_4,
   partition z5      tablespace idx_5,
   partition z6      tablespace idx_6,
   partition z7      tablespace idx_7,
   partition z8      tablespace idx_8);