1.找出emp表中第5到10条记录并按降序排列

1.1   SELECT * FROM emp ORDER BY sal DESC; //查出表中所有数据并按降序排列

1.2   SELECT ROWNUM r,s.* FROM (SELECT * FROM emp ORDER BY sal DESC ) s //把降序排列好的表作为一个临时表

1.3   SELECT t.* FROM (SELECT ROWNUM r,s.* FROM (SELECT * FROM emp ORDER BY sal DESC ) s)t

WHERE r BTTWEEN 5 AND 10   //成功

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