SELECT TRANS_ID
FROM TRANS_INST
WHERE connect_by_isleaf=1
START WITH TRANS_ID =480242
CONNECT BY PRIOR UP_TRANS_ID = TRANS_ID;

说明：

表TRANS_INST（TRANS_ID，UP_TRANS_ID）

480242表示树的任何一个节点

TRANS_ID子节点

UP_TRANS_ID父节点