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create table videos (id int); insert into videos values (1), (2), (3), (4), (5); -- Views table has 3 entries, video 2 watched 2 hours ago, video 4 watched 5 days ago, video 5 watched just now create table views (video_id int, watched_at timestamp); insert into views values (2, current_timestamp - interval '2 hour'), (4, current_timestamp - interval '5 day'), (5, current_timestamp); select id, last_watched_at from videos left join ( select video_id, max(watched_at) last_watched_at from views group by video_id ) last_views on id = video_id order by last_watched_at asc nulls first

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