Oracle的分页方法
程序员文章站
2022-06-16 10:29:13
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- 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