ORACLE 分页查询SQL

1. 根据 ROWID 来分

SELECT * FROM t_xiaoxi WHERE rowid IN(
	SELECT rid FROM (
		SELECT rownum rn,rid FROM(
			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_xiaoxi t
) 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 cid desc) 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

 

SELECT *
FROM   (SELECT a.*,
               rownum rn
        FROM   (SELECT *
                FROM   oc a
                ORDER  BY k001) a
        WHERE  ROWNUM <= 20)
WHERE  rn >= 10 AND rn < 20;
--此处之所以在外面包了一层，是因为 ROWNUM不能像rn一样加条件，只有用里面 SQL检索出的结果集才能分页



SELECT b.*
FROM   (SELECT *
        FROM   (SELECT a.*,
                       rownum rn
                FROM   (SELECT ROWID rid,
                               status
                        FROM   product a
                        WHERE  company_id = ?
                        ORDER  BY status) a
                WHERE  rownum <= 20)
        WHERE  rn > 10 ) a,
       product b
WHERE  a.rid = b.rowid;
--用rowid的方式分页效率比单纯用 rownum的效率要高

 

 

另外加一条：

 

Oracle中复制一张表

 

create table table_name as ( select * from table )