SQL (Oracle) to query for record with max date, only if the end_dt has a value -

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i trying select record row looking @ both start date , end date. need pick max start date, return result max date if end date has value.

i hope images below clarify bit more. in oracle based sql.

enter image description here

example #2

enter image description here

i can, far, either return records or incorrectly return record in scenario #2 i've yet figure out best way make work. greatly appreciate assistance.

thank you!

i use analytic function:

with sample_data (select 1 id, 1 grp_id, to_date('01/01/2015', 'dd/mm/yyyy') st_dt, to_date('23/01/2015', 'dd/mm/yyyy') ed_dt dual union                      select 2 id, 1 grp_id, to_date('24/02/2015', 'dd/mm/yyyy') st_dt, to_date('15/02/2015', 'dd/mm/yyyy') ed_dt dual union                      select 3 id, 1 grp_id, to_date('17/03/2015', 'dd/mm/yyyy') st_dt, to_date('30/03/2015', 'dd/mm/yyyy') ed_dt dual union                      select 4 id, 2 grp_id, to_date('01/01/2015', 'dd/mm/yyyy') st_dt, to_date('17/01/2015', 'dd/mm/yyyy') ed_dt dual union                      select 5 id, 2 grp_id, to_date('21/01/2015', 'dd/mm/yyyy') st_dt, to_date('23/03/2015', 'dd/mm/yyyy') ed_dt dual union                      select 6 id, 2 grp_id, to_date('14/04/2015', 'dd/mm/yyyy') st_dt, to_date('16/05/2015', 'dd/mm/yyyy') ed_dt dual union                      select 7 id, 2 grp_id, to_date('28/05/2015', 'dd/mm/yyyy') st_dt, null ed_dt dual),              res (select id,                             grp_id,                             st_dt,                             ed_dt,                             max(st_dt) on (partition grp_id) max_st_dt                        sample_data) select id,        grp_id,        st_dt,        ed_dt   res  st_dt = max_st_dt ,    ed_dt not null;           id     grp_id st_dt      ed_dt      ---------- ---------- ---------- ----------          3          1 17/03/2015 30/03/2015

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