please help

hi every one

here i need to set display_volume to be null with in whole hour intervals where rule2 apllied in hour

in below example only three intervals

07:20,07:25,07:30 is null i need to set from 07:00 ,07:10,07:15.....,07:55 as null for whole hour intervals

CREATE TABLE C2.TMP_DATA_MINS

(

DAYASDATE DATE,

HOURASNUMBER VARCHAR2(10 BYTE),

COSIT INTEGER,

LANEDIRECTION INTEGER,

RAW_VOLUME NUMBER,

DISPLAY_VOLUME NUMBER,

RULE_APPLIED VARCHAR2(200 BYTE)

)

sample data

DAYASDATE	HOURASNUMBER	COSIT	LANEDIRECTION	RAW_VOLUME	DISPLAY_VOLUME	RULE_APPLIED
12/25/2013 07:00:00	07	42	1	54	54
12/25/2013 07:05:00	07	42	1	58	58
12/25/2013 07:10:00	07	42	1	49	49
12/25/2013 07:15:00	07	42	1	53	53
12/25/2013 07:20:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:25:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:30:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:35:00	07	42	1	54	54
12/25/2013 07:40:00	07	42	1	50	50
12/25/2013 07:45:00	07	42	1	41	41
12/25/2013 07:50:00	07	42	1	36	36
12/25/2013 07:55:00	07	42	1	37	37

i need to set display volume to be set null for whole hour intervals

o/p something like

DAYASDATE	HOURASNUMBER	COSIT	LANEDIRECTION	RAW_VOLUME	DISPLAY_VOLUME	RULE_APPLIED
12/25/2013 07:00:00	07	42	1	54		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:05:00	07	42	1	58		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:10:00	07	42	1	49		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:15:00	07	42	1	53		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:20:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:25:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:30:00	7	42	1			Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:35:00	0 7	42	1	54		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:40:00	07	42	1	50		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:45:00	07	42	1	41		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:50:00	07	42	1	36		Rule 2 : Three consecutive time intervals are missing with in the period
12/25/2013 07:55:00	07	42	1	37		Rule 2 : Three consecutive time intervals are missing with in the period

thanks in advance