Calculate difference between 2 date / times in Ora

Question

I have a table as follows:

Filename - varchar
Creation Date - Date format dd/mm/yyyy hh24:mi:ss
Oldest cdr date - Date format dd/mm/yyyy hh24:mi:ss

How can I calcuate the difference in hours minutes and seconds (and possibly days) between the two dates in Oracle SQL?

Thanks

Answer 1

You may also try this:

select to_char(to_date('1970-01-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss')+(end_date - start_date),'hh24:mi:ss')
       as run_time from some_table;

It displays time in more human readable form, like: 00:01:34. If you need also days you may simply add DD to last formatting string.

Answer 2

Here's another option:

with tbl_demo AS
    (SELECT TO_DATE('11/26/2013 13:18:50', 'MM/DD/YYYY HH24:MI:SS') dt1
   , TO_DATE('11/28/2013 21:59:12', 'MM/DD/YYYY HH24:MI:SS') dt2 
     FROM dual)
SELECT dt1
     , dt2
     , round(dt2 - dt1,2) diff_days
     , round(dt2 - dt1,2)*24 diff_hrs
     , numtodsinterval((dt2 - dt1),'day') diff_dd_hh_mm_ss
  from tbl_demo;

Answer 3

You could use to_timestamp function to convert the dates to timestamps and perform a substract operation.

Something like:

SELECT 
TO_TIMESTAMP ('13.10.1990 00:00:00','DD.MM.YYYY HH24:MI:SS')  - 
TO_TIMESTAMP ('01.01.1990:00:10:00','DD.MM.YYYY:HH24:MI:SS')
FROM DUAL

Answer 4

If you want something that looks a bit simpler, try this for finding events in a table which occurred in the past 1 minute:

With this entry you can fiddle with the decimal values till you get the minute value that you want. The value .0007 happens to be 1 minute as far as the sysdate significant digits are concerned. You can use multiples of that to get any other value that you want:

select (sysdate - (sysdate - .0007)) * 1440 from dual;

Result is 1 (minute)

Then it is a simple matter to check for

select * from my_table where (sysdate - transdate) < .00071;

Answer 5

in oracle 11g

select end_date - start_date as day_diff from tablexxx suppose the starT_date end_date is define in the tablexxx

Answer 6

This will count time between to dates:

SELECT
  (TO_CHAR( TRUNC (ROUND(((sysdate+1) - sysdate)*24,2))*60,'999999')
  +
  TO_CHAR(((((sysdate+1)-sysdate)*24)- TRUNC(ROUND(((sysdate+1) - sysdate)*24,2)))/100*60 *100, '09'))/60
FROM dual