--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

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，速度也会越来越慢哦！)

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，速度会越来越慢哦！)

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，速度会越来越慢哦！)

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)

--(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。)

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;