SQL partition by date keeping weekly and sub partition

Partition by date keeping weekly and sub partition by station name alphabetically for huge records in separate sub partition.

PARTITION BY RANGE (CREATED_DATE) INTERVAL (numtodsinterval(7, 'DAY')) 
SUBPARTITION BY RANGE(STATION)
    SUBPARTITION TEMPLATE (
        SUBPARTITION SUB_PART_A VALUES LESS THAN ('B%'),
        SUBPARTITION SUB_PART_B VALUES LESS THAN ('C%'),
        SUBPARTITION SUB_PART_C VALUES LESS THAN ('D%'),
        SUBPARTITION SUB_PART_D VALUES LESS THAN ('E%'),
        SUBPARTITION SUB_PART_E VALUES LESS THAN ('F%'),
        SUBPARTITION SUB_PART_F VALUES LESS THAN ('G%'),
        SUBPARTITION SUB_PART_G VALUES LESS THAN ('H%'),
        SUBPARTITION SUB_PART_H VALUES LESS THAN ('I%'),
        SUBPARTITION SUB_PART_I VALUES LESS THAN ('J%'),
        SUBPARTITION SUB_PART_J VALUES LESS THAN ('K%'),
        SUBPARTITION SUB_PART_K VALUES LESS THAN ('L%'),
        SUBPARTITION SUB_PART_L VALUES LESS THAN ('M%'),
        SUBPARTITION SUB_PART_M VALUES LESS THAN ('N%'),
        SUBPARTITION SUB_PART_N VALUES LESS THAN ('O%'),
        SUBPARTITION SUB_PART_O VALUES LESS THAN ('P%'),
        SUBPARTITION SUB_PART_P VALUES LESS THAN ('Q%'),
        SUBPARTITION SUB_PART_Q VALUES LESS THAN ('R%'),
        SUBPARTITION SUB_PART_R VALUES LESS THAN ('S%'),
        SUBPARTITION SUB_PART_S VALUES LESS THAN ('T%'),
        SUBPARTITION SUB_PART_T VALUES LESS THAN ('U%'),
        SUBPARTITION SUB_PART_U VALUES LESS THAN ('V%'),
        SUBPARTITION SUB_PART_V VALUES LESS THAN ('W%'),
        SUBPARTITION SUB_PART_W VALUES LESS THAN ('X%'),
        SUBPARTITION SUB_PART_X VALUES LESS THAN ('Y%'),
        SUBPARTITION SUB_PART_Y VALUES LESS THAN ('Z%'),
        SUBPARTITION SUB_PART_Z_0_9 VALUES LESS THAN (MAXVALUE)
        )   
(
PARTITION OLD_PART_DATA VALUES LESS THAN (TO_DATE('01-AUG-2018', 'dd-mon-yyyy'))
);