Oracle group by minute - sql

Question

I have written a query to get the data received with respect to every hour in a day.
SELECT To_CHAR( A.req_start_time , 'DD/MM/YYYY HH24') as input , count(A.REQUEST_ID)
FROM ILBULK.SAS_RE_TASK_MESSAGE A,ILBULK.SAS_RE_REQUEST_MESSAGE
WHERE A.NE_TYPE = 'HLR'
LIKE '%Synchronous%'
AND A.REQUEST_ID = ILBULK.SAS_RE_REQUEST_MESSAGE.REQUEST_ID and A.REQ_START_TIME > to_DATE ('12/26/2014 00', 'MM/DD/YYYY HH24') and A.REQ_START_TIME < to_DATE('12/27/2014 00', 'MM/DD/YYYY HH24')
GROUP BY To_CHAR(A.REQ_START_TIME, 'DD/MM/YYYY HH24');
And I am getting following response
26/12/2014 02 13823
26/12/2014 14 4681
26/12/2014 12 2939
26/12/2014 18 457
26/12/2014 03 34327
26/12/2014 04 15673
26/12/2014 19 28885
26/12/2014 06 70699
26/12/2014 10 10743
Now i want to get data with respect to every minute ordered in ascending order, I have tried to split the hours but nothings working. How do I do that?

Answer 1

Use to_char(A.req_start_time , 'DD/MM/YYYY HH24:MI'), where MI is the minutes part. Add the same to the SELECT as well as GROUP BY clause.
SELECT To_char(A.req_start_time, 'DD/MM/YYYY HH24:MI') AS input,
Count(A.request_id)
FROM ilbulk.sas_re_task_message A,
ilbulk.sas_re_request_message
WHERE A.ne_type = 'HLR' LIKE '%Synchronous%'
AND A.request_id = ilbulk.sas_re_request_message.request_id
AND A.req_start_time > To_date ('12/26/2014 00', 'MM/DD/YYYY HH24')
AND A.req_start_time < To_date('12/27/2014 00', 'MM/DD/YYYY HH24')
GROUP BY To_char(A.req_start_time, 'DD/MM/YYYY HH24:MI');
For example,
SQL> SELECT to_char(SYSDATE, 'DD/MM/YYYY HH24:MI') GRP_MIN
2 FROM DUAL
3 GROUP BY to_char(SYSDATE, 'DD/MM/YYYY HH24:MI')
4 /
GRP_MIN
----------------
29/12/2014 11:50
SQL>

Answer 2

Your query doesn't appear to be including minutes in any of the date/time strings. You could try the following pattern:
'DD/MM/YYYY HH24:MI' - where MI represents minutes
For ordering purposes, you will need to convert your input field back to a date:
ORDER BY to_date(input, 'DD/MM/YYYY HH24:MI')
If you use the date pattern YYYY/MM/DD HH24:MI, conversion wouldn't be necessary as the Strings would come out in the same order as date/time. In Oracle, ascending sort is assumed but you can add ASC at the end for clarity if you prefer.
If you are after minutes since midnight, you will need something like this:
TO_NUMBER(TO_CHAR(input, 'SSSSS'))/60
In the above, SSSSS represents seconds since midnight - divide by 60 for minutes.

Answer 3

I have figured it out myself. :) Here is the new query
SELECT To_CHAR( A.req_start_time , 'HH24:MI:SS') as input , count(A.REQUEST_ID)
FROM ILBULK.SAS_RE_TASK_MESSAGE A,ILBULK.SAS_RE_REQUEST_MESSAGE
WHERE A.NE_TYPE = 'HLR'
--and ILBULK.SAS_RE_REQUEST_MESSAGE.PROTOCOL LIKE '%SAS%' --and ILINK.SAS_RE_REQUEST_MESSAGE.PROTOCOL LIKE '%Synchronous%'
AND A.REQUEST_ID = ILBULK.SAS_RE_REQUEST_MESSAGE.REQUEST_ID and A.REQ_START_TIME > to_DATE ('12/26/2014 00', 'MM/DD/YYYY HH24') and A.REQ_START_TIME < to_DATE('12/27/2014 00', 'MM/DD/YYYY HH24')
GROUP BY To_CHAR(A.REQ_START_TIME, 'HH24:MI:SS');