SQL terhubung dengan banyak baris

Perbarui

Setelah melihat pembaruan, Anda hanya perlu menghapus START WITH.

Akhiri pembaruan

CONNECT_BY_ROOT adalah yang Anda cari

Pernyataan ini

SELECT distinct RootBoss, Person FROM (
with employee  as 
(
  Select 1 person , null boss from Dual
  UNION Select 2 , 1 from dual
  UNION Select 3 , 2 from dual
)
SELECT CONNECT_BY_ROOT boss RootBoss, person
FROM employee connect_by

  connect by prior person = boss
  ORDER BY person

  ) t
WHERE ROOTBOSS is not null
ORDER BY
RootBoss, Person

Keluaran

ROOTBOSS               PERSON                 
---------------------- ---------------------- 
1                      2                      
1                      3                      
2                      3        

Menambahkan SUMS dan GROUPS cukup mudah