Query to retrieve the number of transactions done in every 1 hour for last

Hi,
Could anyone help in writing a query to retrieve the number of transactions done in every 1 hour for last month.
Case:
I/P
Cases Timestamp1
case1 01-01-2008 00:00:01
case2 01-01-2008 00:01:01
case3 01-01-2008 01:00:01
case1 01-01-2008 01:02:01
case4 01-01-2008 01:10:01
case5 02-01-2008 02:00:01
case6 02-01-2008 02:10:01
case7 02-01-2008 23:00:01
case.. 31-01-2008 24:00:00
O/P
from time to_time cases
01-01-2008 00:00:00 01-01-2008 01:00:00 2
01-01-2008 01:00:01 01-01-2008 02:00:00 3
etc
Any help really appreciated

We can do this using analytical functions
Following is what I did:
create table timestamp1 (ts date)
select *from timestamp1
30/10/2008 15:41:13
30/10/2008 15:41:05
30/10/2008 15:40:03
30/10/2008 14:58:26
30/10/2008 14:29:45
30/10/2008 13:17:48
30/10/2008 08:29:50
30/10/2008 06:05:51
30/10/2008 03:41:52
30/10/2008 02:29:54
select distinct to_char(ts,'hh24') frmhrs,
to_char(ts,'hh24')+1 tohrs, count(ts) OVER (order by to_number(to_char(ts,'hh24')) RANGE (1/24) PRECEDING )
from timestamp1
where trunc(ts)=trunc(sysdate) -- I added this just to make sure I get for today's data
order by frmhrs
FRMHRS     TOHRS     CNT
02     3     1
03     4     1
06     7     1
08     9     1
13     14     1
14     15     2
15     16     3
You can customizeas per ur need.

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