SQL connect by for mange rækker

Opdater

Når du har set din opdatering, skal du bare slippe START MED.

Afslut opdatering

CONNECT_BY_ROOT er det, du leder efter

Denne erklæring

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

Udgange

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

Det er ret nemt at tilføje SUMMER og GRUPPER