Oracle实现分页查询的SQL语法汇总

数据库  /  管理员 发布于 7年前   206

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_ALIASWHERE 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_ALIASwhere 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_ALIASWHERE 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_ALIASwhere 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') andto_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。