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create table t as select 1000 as id, null as value from dual union all select 1000, 'En' from dual union all select 1000, 'Fr' from dual union all select 1000, 'Es' from dual union all select 1001, 'En' from dual union all select 1001, 'Fr' from dual union all select 1001, 'Es' from dual
7 rows affected
select t.* from t order by rank() over (partition by id order by (case when value is null then 1 else 2 end)) fetch first 1 row with ties;
ID
VALUE
1000
null
1001
En
1001
Fr
1001
Es