SELECT e.start_time, ne.start_time, e.end_time
    FROM
        (SELECT e.ID, e.start_time, e.end_time, ROW_NUMBER() OVER (PARTITION BY e.ID ORDER BY e.start_time) AS "SEQ"
        FROM events e
        )e
    LEFT JOIN
        (SELECT ne.ID, ne.start_time, ne.end_time, ROW_NUMBER() OVER (PARTITION BY ne.ID ORDER BY ne.start_time) AS "nSEQ"
        FROM events ne
        )ne
    ON e.ID = ne.ID
    AND e.SEQ = ne.nSEQ - 1