Date field - Hourly report
Hello All,
If I have a table 'TMP_LOGING' with a date column 'Created' and a number column 'LOGINS', how can I pull hourly logins from these table?
Thanks!
Hi,
If you pass a 2nd argument to TRUNC (dt), it (basically) returns the DATE that is like dt as far as the 2nd argument specifies, but with all the smaller time divisions set to their lowest possible values.
SELECT TRUNC (created, 'HH') AS hour
, COUNT (*) AS total_logins
FROM tmp_loging
GROUP BY TRUNC (created, 'HH')
ORDER BY TRUNC (created, 'HH')
;If created is
June 18, 2010 14:09:48, then TRUNC (created, 'HH') returns
June 18, 2010 14:00:00.
That is, since the 2nd argument was the format specifier for hours, the hour of the two DATEs, and all the larger time divisions (day, mont, and year) are the same, but the smaller time divisions (minute, second) of the value returned are as low as they can possibly be.
Edited by: Frank Kulash on Jun 18, 2010 2:04 PM
Added explanation.
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Hi Guys,
Hope you are doing well.
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Arijityou may try something like
with testdata as (
select sysdate - level/24 t from dual
connect by level <11
select
to_char(sysdate, 'DD-MM-YYYY HH24:MI:SS') s
, to_char(t, 'DD-MM-YYYY HH24:MI:SS') t from testdata
where
t >= trunc(sysdate, 'HH') - numtodsinterval(4, 'HOUR')
S T
19-06-2012 16:08:21 19-06-2012 15:08:21
19-06-2012 16:08:21 19-06-2012 14:08:21
19-06-2012 16:08:21 19-06-2012 13:08:21
19-06-2012 16:08:21 19-06-2012 12:08:21trunc ( ,'HH') truncates the minutes and seconds from the date.
Extract hour works only on timestamps
regards
Edited by: chris227 on 19.06.2012 14:13 -
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