Oracle分页SQL优化

一、分页框架

1.正确的分页框架

select * 

from (select * from (select a.*,rownum rn from (需要分页的SQL) a )

where rownum <=10)

where rn >=1;

2.错误的分页框架

select *

from (select t.* ,rownum rn from (需要分页的SQL) t )

where rn >=1 

and rn <=10;

采用错误的分页框架，会带来严重的性能问题；