Problems while extracting the hours of the Date field

Hi guys,.

We hope that you do well.

I am facing some problems during extraction of the hours of the date field. Here is an example of my orders table:-

Select * from orders;

Arrival time of Order_NO product name
1 computer Office November 20, 10 10:10
2 November 21, 10 17:26:34 portable
3 22 January 11 printer 08:10

Earlier, it is stated that the daily number of orders take place in the roll of the order, I used to write a query

arrival_time > = trunc ((sysdate-1), 'DD')
and arrival_time < trunc ((sysdate), 'DD')

The above query gives me yesterday how many orders have been been held.

Now I have the new requirement to report on every 4 hours the number of orders will be held. For example if the current time is 08:00 IST then the query must extraction from 04:00 until 08:00 how many orders took place. The report will take place at 12:00 IST which will give me an order took place from 08:00 until 12:00.

The report will be run every 4 hours per day and generate report of orders taken place for the past 4 hours. I have a programmer who will run this query every hour, but how to understand to get the order at the request of details who arrived for the past 4 hours. I'm not able to do this using trunc.

Can you please help me how to make this happen. I checked "Extract" also, but I am not convinced.

Help, please.

Thanks in advance
Aalami

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 12:08:21

trunc (, 'HH') truncates the minutes and the seconds of the date.
Extract the hour only works on timestamps
concerning

Published by: chris227 on 19.06.2012 14:13

Tags: Database

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