sql - 父子树的Oracle分层查询连接未知级别深吗？

Question

父子树的Oracle分层查询连接未知级别深吗？很简单，但我似乎无法让它工作......

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Table ABC
 ID      parent_ID   Name  
1          0          Art
2          0          Home
3          0          Contact
4          0          Bob
5          0          Boo
6          0          Foo
7          2          FooBoo
8          5          Hoo
9          8          My
10         2          Rob

Order by Name Results wanted

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Art
Home
** FooBoo
** Rob
Contact
Bob
Boo
** Hoo
** ** My
Foo
FooBoo

Answer 1

SELECT NAME, id, parent_id, LEVEL
FROM ABC
START WITH id = 0
CONNECT BY PRIOR id = parent_id
ORDER SIBLINGS BY NAME;