SELECT a.actor_name FROM revision r JOIN actor a ON r.rev_actor = a.actor_id JOIN (SELECT rev_page, MIN(rev_timestamp) AS first_timestamp FROM revision WHERE rev_page IN (10751159, 10450979, 9224529) GROUP BY rev_page) first_revisions ON r.rev_page = first_revisions.rev_page AND r.rev_timestamp = first_revisions.first_timestamp;