Skip to Main Content
  • Questions

  • query records with timestamp gap 15 minute or more

Breadcrumb

Question and Answer

Connor McDonald

Thanks for the question, Dipak.

Asked: March 06, 2016 - 9:00 am UTC

Last updated: March 07, 2016 - 12:03 am UTC

Version: 11

Viewed 50K+ times! This question is

You Asked

We are storing data in every 30 seconds. No we need to query records for every 15 minutes after a specified timestamp.

and Connor said...

select *
from my_table
where my_column > systimestamp - numtodsinterval(15,'MINUTE')


or

select *
from my_table
where my_column > timestamp '2016-01-01 13:34:00' - numtodsinterval(15,'MINUTE')


etc etc

Remember, you'll only see committed data, so if someone does:

insert 9am
<waits 30mins>
commit;

Then its likely you will *never* see that row, because you didnt see it at 9:15am, and at 9:30 its now too old.

Rating

  (1 rating)

Is this answer out of date? If it is, please let us know via a Comment

Comments

Dipak Pradhan, March 06, 2016 - 1:37 pm UTC

When i am running the below given query no output comes. I need record of onday in every 15 minutes.
query
==========
select *
from DEVICE_POSITION_DATA dpd
where dpd.device_id = 795
and dpd.creation_date > systimestamp - numtodsinterval(15,'MINUTE')
and dpd.creation_date > sysdate - 1
order by dpd.creation_date desc
Connor McDonald
March 07, 2016 - 12:03 am UTC 

SQL> select systimestamp from dual;

SYSTIMESTAMP
-------------------------------------
07-MAR-16 08.02.41.691000 AM +08:00

SQL> create table DEVICE_POSITION_DATA ( device_id int, creation_date timestamp );

Table created.

SQL>
SQL> insert into DEVICE_POSITION_DATA
  2  select 795, sysdate - rownum/1440
  3  from dual
  4  connect by level <= 100;

100 rows created.

SQL>
SQL> commit;

Commit complete.

SQL>
SQL> select *
  2  from DEVICE_POSITION_DATA dpd
  3  where dpd.device_id = 795
  4  and dpd.creation_date > systimestamp - numtodsinterval(15,'MINUTE')
  5  and dpd.creation_date > sysdate - 1
  6  order by dpd.creation_date desc ;

 DEVICE_ID CREATION_DATE
---------- ---------------------------------------------------------------------------
       795 07-MAR-16 08.01.15.000000 AM
       795 07-MAR-16 08.00.15.000000 AM
       795 07-MAR-16 07.59.15.000000 AM
       795 07-MAR-16 07.58.15.000000 AM
       795 07-MAR-16 07.57.15.000000 AM
       795 07-MAR-16 07.56.15.000000 AM
       795 07-MAR-16 07.55.15.000000 AM
       795 07-MAR-16 07.54.15.000000 AM
       795 07-MAR-16 07.53.15.000000 AM
       795 07-MAR-16 07.52.15.000000 AM
       795 07-MAR-16 07.51.15.000000 AM
       795 07-MAR-16 07.50.15.000000 AM
       795 07-MAR-16 07.49.15.000000 AM
       795 07-MAR-16 07.48.15.000000 AM

14 rows selected.


Send me your testcase like the one above so we can see where things are different in your environment
more

Connor and Chris don't just spend all day on AskTOM. You can also catch regular content via Connor's blog and Chris's blog. Or if video is more your thing, check out Connor's channel and Chris's channel from their Youtube channels. And of course, keep up to date with AskTOM via the official twitter account.