請參考:
http://delphi.ktop.com.tw/topic.asp?TOPIC_ID=44484
僅 oracle support 的 CONNECT BY / START WITH 的語法, 在單一資料關連表的展開使用上相當方便, 請參考此篇文章!
SELECT LEVEL,
PARENT_MENU_ID,
MENU_ID,
SEQNO,
NAME,DESCRIPTION
FROM MENU
CONNECT BY PARENT_MENU_ID = PRIOR MENU_ID
START WITH PARENT_MENU_ID IS NULL