Question

How would I get one row out of two overlaping dates rows from the same table for same id. I have more then 50000 records.

I have following sample data.

ID    start_dt    end_dt       division
1212  04/01/2006  03/01/2007   second
1212  05/01/2009  01/01/2010   second
1212  04/01/2006  03/01/2008   second   --- This should be selected as longest timeframe
1212  09/03/2007  03/01/2008   third
1213  05/03/2005  04/11/2009   second
1214  07/03/2007  03/01/2008   third

And the data I should get as following.

ID    start_dt    end_dt       division
1212  04/01/2006  03/01/2008   second
1212  05/01/2009  01/01/2010   second
1213  05/03/2005  04/11/2009   second
1214  07/03/2007  03/01/2008   third

Thank you.
Ramu

Answer 1

Now that I understand your issue, just subtract the 2 dates to determine the time frame difference:

SELECT S.Id, S.Start_dt, S.End_dt, S.Division
FROM Sample S
 JOIN (
   SELECT S.Id, Max(S.end_dt-S.start_dt) as timeframe
FROM Sample S
GROUP BY S.Id ) S2 ON S.Id = S2.Id 
    AND S.end_dt-S.start_dt = s2.timeframe

Here is the Fiddle.

Good luck.