oracle实现分页时，需要引入一个rownum的函数
方法一：使用rownum嵌套查询
select * from ( select e.* , rownum as rn from emp e where rownum <= 10 ) t where t.rn >= 1;
方法二：方法一的另一种写法
select * from ( select e.* , rownum as rn from emp e) t where t.rn >= 1 and t.rn <=10;
方法三：使用分析函数row_number
select * from ( select t.* , row_number() over(order by ename) as rn from emp t ) where rn>=1 and rn<=10
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方法四：使用rowid
select * from emp where rowid in ( select rid from (select rowid as rid, rownum as id from emp t where rownum < 15) where id >= 10 );
方法五：使用minus
select * from emp where rownum <= 15 minus select * from emp where rownum < 10;