本文实例汇总了Oracle实现分页查询的SQL语法,整理给大家供大家参考之用,详情如下:
1.无ORDER BY排序的写法。(效率最高)
经过测试,此方法成本最低,只嵌套一层,速度最快!即使查询的数据量再大,也几乎不受影响,速度依然!
sql语句如下:
SELECT *
FROM (Select ROWNUM AS ROWNO, T.*
from k_task T
where Flight_date between to_date('20060501', 'yyyymmdd') and
to_date('20060731', 'yyyymmdd')
AND ROWNUM = 20) TABLE_ALIAS
WHERE TABLE_ALIAS.ROWNO >= 10;
2.有ORDER BY排序的写法。(效率最高)
经过测试,此方法随着查询范围的扩大,速度也会越来越慢!
sql语句如下:
SELECT *
FROM (SELECT TT.*, ROWNUM AS ROWNO
FROM (Select t.*
from k_task T
where flight_date between to_date('20060501', 'yyyymmdd') and
to_date('20060531', 'yyyymmdd')
ORDER BY FACT_UP_TIME, flight_no) TT
WHERE ROWNUM = 20) TABLE_ALIAS
where TABLE_ALIAS.rowno >= 10;
3.无ORDER BY排序的写法。(建议使用方法1代替)
此方法随着查询数据量的扩张,速度会越来越慢!
sql语句如下:
SELECT *
FROM (Select ROWNUM AS ROWNO, T.*
from k_task T
where Flight_date between to_date('20060501', 'yyyymmdd') and
to_date('20060731', 'yyyymmdd')) TABLE_ALIAS
WHERE TABLE_ALIAS.ROWNO = 20
AND TABLE_ALIAS.ROWNO >= 10;
TABLE_ALIAS.ROWNO between 10 and 100;
4.有ORDER BY排序的写法.(建议使用方法2代替)
此方法随着查询范围的扩大,速度也会越来越慢!
sql语句如下:
SELECT *
FROM (SELECT TT.*, ROWNUM AS ROWNO
FROM (Select *
from k_task T
where flight_date between to_date('20060501', 'yyyymmdd') and
to_date('20060531', 'yyyymmdd')
ORDER BY FACT_UP_TIME, flight_no) TT) TABLE_ALIAS
where TABLE_ALIAS.rowno BETWEEN 10 AND 20;
5.另类语法。(有ORDER BY写法)
该语法风格与传统的SQL语法不同,不方便阅读与理解,为规范与统一标准,不推荐使用。此处贴出代码供大家参考之用。
sql语句如下:
With partdata as(
SELECT ROWNUM AS ROWNO, TT.* FROM (Select *
from k_task T
where flight_date between to_date('20060501', 'yyyymmdd') and
to_date('20060531', 'yyyymmdd')
ORDER BY FACT_UP_TIME, flight_no) TT
WHERE ROWNUM = 20)
Select * from partdata where rowno >= 10;
6.另类语法 。(无ORDER BY写法)
With partdata as(
Select ROWNUM AS ROWNO, T.*
From K_task T
where Flight_date between to_date('20060501', 'yyyymmdd') and
To_date('20060531', 'yyyymmdd')
AND ROWNUM = 20)
Select * from partdata where Rowno >= 10;
相信本文所述代码能够对大家有一定的参考借鉴价值。
您可能感兴趣的文章:- Oracle 左连接(+)加号用法及常用语法之间的关系
- Oracle存储过程循环语法实例分析
- MySQL与Oracle的语法区别详细对比
- Oracle存储过程基本语法介绍
- SQLServer 2005 和Oracle 语法的一点差异小结
- Oracle存储过程入门学习基本语法
- oracle基础语法详解