http://blog.youkuaiyun.com/oldwolf1987/archive/2009/04/06/4051396.aspx
SELECT * FROM
(
SELECT A.*, ROWNUM RN
FROM (SELECT * FROM TABLE_NAME) A
WHERE ROWNUM <= 40
)
WHERE RN >= 21
http://blog.youkuaiyun.com/oldwolf1987/archive/2009/04/06/4051396.aspx
SELECT * FROM
(
SELECT A.*, ROWNUM RN
FROM (SELECT * FROM TABLE_NAME) A
WHERE ROWNUM <= 40
)
WHERE RN >= 21