编辑:得到了通用的。最终真的很简单(但是花了我一段时间才到达那里)
WITH words AS
( SELECT REGEXP_SUBSTR( '&txt', '\S+', 1, LEVEL ) AS word
, LEVEL AS num
FROM DUAL
CONNECT BY LEVEL <= LENGTH( REGEXP_REPLACE( '&txt', '\S+\s*', 'X' ) )
)
SELECT SYS_CONNECT_BY_PATH( W.word, ' ' )
FROM words W
CONNECT BY NOCYCLE PRIOR W.num != W.num
Edit2:删除了多余的maxnum东西。先前尝试遗留下来的