DROP TABLE IF EXISTS appointment_events;
CREATE TABLE appointment_events
(
    _appointment_id UInt32,
    _id String,
    _status String,
    _set_by_id String,
    _company_id String,
    _client_id String,
    _type String,
    _at String,
    _vacancy_id String,
    _set_at UInt32,
    _job_requisition_id String
) ENGINE = Memory;

INSERT INTO appointment_events (_appointment_id, _set_at, _status) values (1, 1, 'Created'), (2, 2, 'Created');

SELECT A._appointment_id,
       A._id,
       A._status,
       A._set_by_id,
       A._company_id,
       A._client_id,
       A._type,
       A._at,
       A._vacancy_id,
       A._set_at,
       A._job_requisition_id
FROM appointment_events A ANY
LEFT JOIN
  (SELECT _appointment_id,
          MAX(_set_at) AS max_set_at
   FROM appointment_events
   WHERE _status in ('Created', 'Transferred')
   GROUP BY _appointment_id ) B USING _appointment_id
WHERE A._set_at = B.max_set_at;

DROP TABLE appointment_events;