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select emp_id,rownum from emp
µÚÒ»²½£¬²éѯ½á¹û,rownum´ý¶¨
emp_id rownum
1         ?   1
2         ?   2
3         ?   3
4         ?
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µÚÒ»ÐУ¬rownum³õʼ·ÖÅäΪ1£¬Âú×ãrownum <3µÄÌõ¼þ£¬È»ºórownum¼Ó1
µÚ¶þÐУ¬rownumÏÖÔÚΪ2,Âú×ã < 3µÄÌõ¼þ,È»ºórownum¼Ó1
.....
µÚ¶þ²½£¬ÏÖÔÚ¼ÙÉèÓà rownum > 2µÄÌõ¼þÀ´¹ýÂË
ÏÖÔÚ¿´µÚÒ»ÐУ¬rownum³õʼ·ÖÅäΪ1£¬ ²»Âú×ãrownum>2µÄÌõ¼þ,rownum²»»á¼Ó1
µÚ¶þÐУ¬rownum»¹ÊÇ1£¬Í¬Ñù²»Âú×ã>2µÄÌõ¼þ
....
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    select * from
               (select t.*,rwonum rn
              from emp t
               where rownum < 5 )
       where rn > 3


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