SELECT
    f.node_id,
    n.node_type,
    n.question_text,
    uniqExact(f.session_id) AS conversations_reached
FROM fact_treble_session_nodes AS f
LEFT JOIN dim_poll_nodes AS n
    ON n.company_id = f.company_id AND n.poll_id = f.poll_id AND n.node_id = f.node_id
WHERE f.poll_id = {your_poll_id}
  AND f.entered_at >= today() - 30
GROUP BY f.node_id, n.node_type, n.question_text
ORDER BY conversations_reached DESC