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:
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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:
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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:
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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:
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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:
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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)
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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。