【转】oracle CONNECT BY PRIOR叶子节点查找根节点

 　　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