Primo group by organization_core_id per ottenere gli ID delle righe con gli ultimi valori non nulli per slug e name e poi unisciti al tavolo:
select
t.organization_core_id,
t1.slug,
t2.name
from (
select
organization_core_id,
max(case when slug is not null then id end) slugid,
max(case when name is not null then id end) nameid
from tablename
group by organization_core_id
) t
left join tablename t1 on t1.id = t.slugid
left join tablename t2 on t2.id = t.nameid
Guarda la demo
.
Risultati:
> organization_core_id | slug | name
> -------------------: | :------------- | :---------
> 1 | dolphin | Dolphin v2
> 2 | sea-horse-club | Sea Horse
