如下是已经建好的分区表，如何修改为分区：PARTITION BY RANGE (COLLECTDATE) subpartition by hash(EQUIP_ID,IFINDEX)(
....
TABLE NETWORK_FLOWTABLE_TEST
(
EQUIP_ID NUMBER(20) NOT NULL,
IFINDEX NUMBER(10),
COLLECTDATE DATE,
RXUTIL NUMBER(20,4),
TXUTIL NUMBER(20,4),
RXBPS NUMBER(20,4),
TXBPS NUMBER(20,4),
CLEANID1 NUMBER(20),
CLEANID2 NUMBER(20),
CLEANID3 NUMBER(20),
PERIOD NUMBER(4) DEFAULT '0'
)PARTITION BY RANGE (COLLECTDATE) subpartition by hash(EQUIP_ID)(
PARTITION VALUES LESS THAN (TO_DATE('2012-01-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-02-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-03-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-04-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-05-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-06-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-07-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-08-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-09-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-10-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-11-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2012-12-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-01-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-02-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-03-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-04-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-05-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-06-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-07-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-08-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-09-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-10-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-11-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2013-12-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-01-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-02-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-03-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-04-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-05-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-06-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-07-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-08-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-09-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-10-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-11-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2014-12-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-01-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-02-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-03-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-04-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-05-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-06-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-07-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-08-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-09-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-10-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-11-01','YYYY-MM-DD')),
PARTITION VALUES LESS THAN (TO_DATE('2015-12-01','YYYY-MM-DD')),