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with tab (room_id, name, time) as (select 1, 'Kate' , to_date('18.09.2019 10:00', 'dd.mm.yyyy hh24:mi') from dual union all select 1, 'Michael', to_date('18.09.2019 12:00', 'dd.mm.yyyy hh24:mi') from dual union all select 1, 'George' , to_date('18.09.2019 14:00', 'dd.mm.yyyy hh24:mi') from dual union all select 2, 'Tom' , to_date('17.09.2019 09:00', 'dd.mm.yyyy hh24:mi') from dual union all select 2, 'Ben' , to_date('17.09.2019 15:00', 'dd.mm.yyyy hh24:mi') from dual union all select 3, 'Joerge' , to_date('16.09.2019 17:00', 'dd.mm.yyyy hh24:mi') from dual ), t1 as ( select t.*, row_number() over (partition by room_id order by room_id, time desc) as rn from tab t ) select room_id, name, time from t1 where rn = 1 and room_id = 2--N
ROOM_ID
NAME
TIME
2
Ben
17-SEP-19