ORACLE分页查询SQL语法

11/27/2009来源:Oracle教程人气:12640

--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!) ­

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 &shy;

WHERE TABLE_ALIAS.ROWNO >= 10; &shy;

&shy;

--2:有ORDER BY排序的写法。(效率最高) &shy;

--(经过测试,此方法随着查询范围的扩大,速度也会越来越慢哦!) &shy;

SELECT * &shy;

  FROM (SELECT TT.*, ROWNUM AS ROWNO &shy;

           FROM (Select t.* &shy;

                    from k_task T &shy;

                   where flight_date between to_date('20060501', 'yyyymmdd') and &shy;

                         to_date('20060531', 'yyyymmdd') &shy;

                   ORDER BY FACT_UP_TIME, flight_no) TT &shy;

          WHERE ROWNUM <= 20) TABLE_ALIAS &shy;

where TABLE_ALIAS.rowno >= 10; &shy;

&shy;

--3:无ORDER BY排序的写法。(建议使用方法1代替) &shy;

--(此方法随着查询数据量的扩张,速度会越来越慢哦!) &shy;

SELECT * &shy;

  FROM (Select ROWNUM AS ROWNO, T.* &shy;

           from k_task T &shy;

          where Flight_date between to_date('20060501', 'yyyymmdd') and &shy;

                to_date('20060731', 'yyyymmdd')) TABLE_ALIAS &shy;

WHERE TABLE_ALIAS.ROWNO <= 20 &shy;

   AND TABLE_ALIAS.ROWNO >= 10; &shy;

--TABLE_ALIAS.ROWNO  between 10 and 100; &shy;

&shy;

--4:有ORDER BY排序的写法.(建议使用方法2代替) &shy;

--(此方法随着查询范围的扩大,速度会越来越慢哦!) &shy;

SELECT * &shy;

  FROM (SELECT TT.*, ROWNUM AS ROWNO &shy;

           FROM (Select * &shy;

                    from k_task T &shy;

                   where flight_date between to_date('20060501', 'yyyymmdd') and &shy;

                         to_date('20060531', 'yyyymmdd') &shy;

                   ORDER BY FACT_UP_TIME, flight_no) TT) TABLE_ALIAS &shy;

where TABLE_ALIAS.rowno BETWEEN 10 AND 20; &shy;

&shy;

&shy;

--5另类语法。(有ORDER BY写法) &shy;

--(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。) &shy;

With partdata as( &shy;

  SELECT ROWNUM AS ROWNO, TT.*  FROM (Select * &shy;

                  from k_task T &shy;

                 where flight_date between to_date('20060501', 'yyyymmdd') and &shy;

                       to_date('20060531', 'yyyymmdd') &shy;

                 ORDER BY FACT_UP_TIME, flight_no) TT &shy;

   WHERE ROWNUM <= 20) &shy;

    Select * from partdata where rowno >= 10; &shy;

&shy;

--6另类语法 。(无ORDER BY写法) &shy;

With partdata as( &shy;

  Select ROWNUM AS ROWNO, T.* &shy;

    From K_task T &shy;

   where Flight_date between to_date('20060501', 'yyyymmdd') and &shy;

         To_date('20060531', 'yyyymmdd') &shy;

     AND ROWNUM <= 20) &shy;

    Select * from partdata where Rowno >= 10;   &shy;