Re: SQL Query: Counting records by Time Interval

From: Chris Colclough <chris.colclough_at_no_spam.jhuapl.edu>
Date: Mon, 25 Jun 2007 12:27:00 -0400
Message-ID: <f5oqcm$j23$1@aplnetnews.jhuapl.edu>

<timmyojo_at_gmail.com> wrote in message
news:1182782705.156059.238380_at_q69g2000hsb.googlegroups.com...
>I have a table that tracks Request and Response data coming in and out
> of a system from different systems. Easch transaction originates from
> an external system, comes into the serving system as a Request (RQST),
> is TimeStamped (RQST_TM) and a response is generated (RSPN) and the
> response is TimeStamped (RPSN) and sent to the client system. Some of
> the columns in the table are as follows:
> ECTN CHARACTER 12 NOT NULLABLE
> TRX_TYPE CHARACTER 3 NOT NULLABLE
> RQST VARCHAR 600 NOT NULLABLE
> RQST_TM TIMESTAMP 10 NOT NULLABLE
> RSPN VARCHAR 600 NULLABLE
> RSPN_TM TIMESTAMP 10 NULLABLE
> ORIG_CD CHARACTER 2 NOT NULLABLE
>
> I need to be able to view the number of requests (COUNT) that come in
> by hour intervals (for example between the hours of 8 and 9am, 9 and
> 10 am, 10 and 11am, etc) for a particular day and the peak time period
> the system recieves requests. Could someone help me?
>
> Thanks,
> Tim
>

try:

select count(*)
from .....
group by trunc(rqst_tm, 'hh24'), Received on Mon Jun 25 2007 - 11:27:00 CDT