Oracle分页Sql

1.根据ROWID来分<!--more-->
 
select * from t_xiaoxi where rowid in(select rid from (select rownum rn,ridfrom(select rowid rid,cid from 
t_xiaoxi  order by cid desc) where rownum<10000) where rn>9980)order by cid desc; 
 
select * from t_xiaoxi where rowid in(select rid from (select rownum rn,ridfrom(select rowid rid,cid from
t_xiaoxi  order by cid desc) where rownum<10000) where rn>9980)order by cid desc;
 
执行时间0.03秒
2.按分析函数来分
 
select * from (select t.*,row_number() over(order by cid desc) rk from t_xiaoxit) where rk<10000 and rk>9980; 
 
select * from (select t.*,row_number() over(order by cid desc) rk from t_xiaoxit) where rk<10000 and rk>9980;
 
执行时间1.01秒
3.按ROWNUM来分
 
select * from(select t.*,rownum rn from(select * from t_xiaoxi order by ciddesc) t where rownum<10000) where 
rn>9980; 
 
select * from(select t.*,rownum rn from(select * from t_xiaoxi order by ciddesc) t where rownum<10000) where
rn>9980;
 
执行时间0.1秒
其中t_xiaoxi为表名称,cid为表的关键字段,取按CID降序排序后的第9981-9999条记录,t_xiaoxi表有70000多条记录
个人感觉1的效率最好,3次之,2最差  
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