Oracle分页查询的提升阶段

--Oracle分页查询

--简单初级阶段

SELECT * FROM (SELECT * FROM score s ORDER BY math DESC) WHERE ROWNUM = 1;

--中级阶段,基本实现了结果,但仍有可优化的空间!

SELECT *

  FROM (SELECT so.*, ROWNUM rw

          FROM (SELECT * FROM score s ORDER BY math DESC) so) sa

 WHERE sa.rw >= 1

   AND sa.rw <= 4;

--究极形态...!效率最高!

SELECT *

  FROM (SELECT SO.*, ROWNUM RW

          FROM (SELECT * FROM SCORE S ORDER BY MATH DESC) SO

         WHERE ROWNUM <= 4) SA

 WHERE SA.RW >= 1;

想继续深入,可参照大牛的这篇文章:

http://blog.csdn.net/anxpp/article/details/51534006