Question

I have the following oracle database table USERS

I have to display the user status begin date&time and end date&time for each status.

From the above example I need to display like STEVE BALE is LOGGED_OUT from 01/08/2013 12:00:00 AM to 01/08/2013 5:04:24.736437 AM

and UNAVAILABLE from 01/08/2013 5:04:24.736437 AM to 01/08/2013 6:04:24.736437 AM,

and AVAILABLE from 01/08/2013 6:04:24.736437 AM to 01/08/2013 7:31:08.591801 AM…

similarly for the given day last record new status, useR STEVE BALE is LOGGED_OUT from 01/08/2013 11:30:50.724405 AM to 01/08/2013 11:59:59 PM..

Thank you for your time.

Answer 1

This is actually pretty easy, because oracle has the lead() function. Something like:

select t.*,
       lead(status_change_date) over (partition by user_name order by status_change_date) as end_status_time
from t

For a string, you can do something like:

select (t.user_name||' is '||t.new_status||' from '||
        to_char(status_change_date, 'mm/dd/yyyy hh:mi')+' to '||
        to_char(lead(status_change_date) over (partition by user_name order by status_change_date),
                'mm/dd/yyyy hh:mi')
       ) as thestring
from t