Date & time difference in a single column but multiple rows in a table

Question

hi folks,
am using Oracle db 10g by chance is there any other way to do my requirement.
as I stated in my subject.

Answer 1

You probably need LAG:
SQL> -- generating sample data (how hard can it be...)
SQL> with testdata as (
  2  select 200 bno, 32 temperature, to_date('28.05.2012 09:00:00', 'dd.mm.yyyy hh24:mi:ss') dt from
dual union
  3  select 200, 36,to_date('28.05.2012 15:00:00', 'dd.mm.yyyy hh24:mi:ss') from dual
  4  )
  5  --
  6  -- actual query:
  7  --
  8  select bno
  9  ,      temperature
10  ,      dt
11  ,      numtodsinterval(dt-lag(dt) over (partition by bno order by dt), 'day') difference_int
12  ,      substr((numtodsinterval(dt-lag(dt) over (partition by bno order by dt), 'day')), 12, 8)
difference_dt
13  from   testdata;
       BNO TEMPERATURE DT                  DIFFERENCE_INT                 DIFFEREN
       200          32 28-05-2012 09:00:00
       200          36 28-05-2012 15:00:00 +000000000 06:00:00.000000000  06:00:00
2 rows selected.But, as Paulie already said: still insufficient input. We know nothing about your datatypes. I assumed you're using a DATE.