Можно ли получить такой результат одним запросам

fio           price   dt
Петров    4500   2017-11-01 13:20:21
Сидоров  3000   2017-11-02 08:09:08
Сидоров  1000   2017-11-09 08:11:34
Сидоров  2000   2017-11-20 16:17:12
Петров    1000   2017-12-01 08:32:49

Ожидание:
Петров     2017-11-01 13:20:21   2017-11-01 13:20:21
Сидоров   2017-11-02 08:09:08   2017-11-20 16:17:12
Петров     2017-12-01 08:32:49   2017-12-01 08:32:49

SELECT 
  fio,
  MIN(dt) AS START,
  MAX(dt) AS stop,
FROM
  RBCTNCSCNHNH
GROUP BY
  fio
ORDER BY START ASC

SELECT 
 fio,
 MIN(dt) AS START,
 MAX(dt) AS stop,
FROM
 RBCTNCSCNHNH
GROUP BY
 fio, trunc(dt,'mm')
ORDER BY START ASC

Петров    4500   2017-11-01 13:20:21   1
Сидоров  3000   2017-11-02 08:09:08   2
Сидоров  1000   2017-11-09 08:11:34   2
Сидоров  2000   2017-11-20 16:17:12   2
Петров    1000   2017-12-01 08:32:49   3

SELECT 
 fio,
 MIN(dt) AS START,
 MAX(dt) AS stop
FROM (
SELECT 
  fio, price, dt, 
  SUM(fl) OVER (ORDER BY dt) ss
FROM (
SELECT 
  fio, price, dt, 
  CASE WHEN fio=lag(fio,1) OVER (ORDER BY dt) THEN 0 ELSE 1 END fl
FROM
 RBCTNCSCNHNH
))
GROUP BY fio, ss

SELECT 
 fio,
 MIN(dt) AS START,
 MAX(dt) AS stop
FROM (
SELECT 
  fio, price, dt, 
  SUM(fl) OVER (ORDER BY dt) ss
FROM (
SELECT 
  fio, price, dt, 
  CASE WHEN fio=lag(fio,1) OVER (ORDER BY dt) THEN 0 ELSE 1 END fl
FROM
 RBCTNCSCNHNH
))
GROUP BY fio, ss