Oracle10g 需要检索不在所选列表开头或结尾的n行
我已经编写了sql语句:Oracle10g 需要检索不在所选列表开头或结尾的n行,oracle10g,Oracle10g,我已经编写了sql语句: select * from ( select count(*) as NumberofSignals,signals.transmitter_account,signals.class,signals.type,signals.signal_mode, signals.area_id,signals.sector_id,signals.region_info_id,signals.zone_info_id,signals.user_id,sign
select * from (
select count(*) as NumberofSignals,signals.transmitter_account,signals.class,signals.type,signals.signal_mode,
signals.area_id,signals.sector_id,signals.region_info_id,signals.zone_info_id,signals.user_id,signals.device_id,
signals.panel_name,signals.panel_id,signals.sector_name,signals.region_code,signals.area_name,signals.zone_code,
signals.description,signals.transmitter_name,signals.transmitter_id,signals.color,'event' as Event,get_name(signals.id,'event') as event_value,
'packetnumber' as packetnumber,get_name(signals.id,'packetnumber') as packetnumber_value,wm_concat(distinct get_name(signals.id,'repeater')) as repeater,
round(avg(get_name(signals.id,'signallevel'))) as avg_signallevel,min(to_char(signals.signal_forming_time, 'yyyy/mm/dd hh24:mi:ss')) as formingtime,
get_name(signals.id,'address') as address,get_name(signals.id,'username') as username,get_name(signals.id,'chaneltype') as channeltype,
get_name(signals.id,'code') as code,get_name(signals.id,'account') as account
from signals,signal_custom_fields where signals.id = signal_custom_fields.signal_id and
signals.id in (select id from (select id,rownum num from((select signals.id
from signals,signal_custom_fields where signal_custom_fields.field_name = 'event'
and signal_custom_fields.field_value is not null and signals.id = signal_custom_fields.signal_id
and signals.signal_forming_time >= to_date('2011/5/10 14:34:44', 'yyyy/mm/dd hh24:mi:ss')
AND signals.signal_forming_time <= to_date('2011/5/10 15:34:44', 'yyyy/mm/dd hh24:mi:ss'))
intersect (select distinct signals.id from signals,signal_custom_fields
where signal_custom_fields.field_name = 'packetnumber' and signal_custom_fields.field_value is not null
and signals.id = signal_custom_fields.signal_id
and signals.signal_forming_time >= to_date('2011/5/10 14:34:44', 'yyyy/mm/dd hh24:mi:ss')
AND signals.signal_forming_time <= to_date('2011/5/10 15:34:44', 'yyyy/mm/dd hh24:mi:ss')))
order by id desc)) group by 'event',signals.transmitter_account,signals.class,
signals.type,signals.signal_mode,signals.area_id,signals.sector_id,signals.region_info_id,signals.zone_info_id,
signals.user_id,signals.device_id,signals.panel_name,signals.panel_id,signals.sector_name,signals.region_code,
signals.area_name,signals.zone_code,signals.description,signals.transmitter_name,signals.transmitter_id,
signals.color, get_name(signals.id,'event'), 'packetnumber',get_name(signals.id,'username'),
get_name(signals.id,'chaneltype'),
get_name(signals.id,'code'),
get_name(signals.id,'account'), get_name(signals.id,'packetnumber'),get_name(signals.id,'address'),
TO_CHAR(signals.signal_forming_time ,'dd/mm/yyyy hh24'),
TRUNC(to_number(to_char(signals.signal_forming_time ,'mi'))/(30))
order by event)where rownum < 300
这里我得到了前300行,但是我需要如何重写这个语句来检索第二个300行呢?您的查询没有在第一个嵌套表中列出rownum。在第一个嵌套表中添加rownum列,然后可以在顶层的where子句中执行BEVER函数:
--create a demo table
DROP TABLE paging_test;
CREATE TABLE paging_test AS
(SELECT rownum x FROM user_tables
);
--count how many records exist (in my case there is 821)
SELECT COUNT(*)
FROM paging_test;
--get the first 300 rows
SELECT *
FROM
(SELECT rownum rn, x FROM paging_test ORDER BY x
) pt
WHERE pt.rn BETWEEN 1 AND 300 ;
--get the next 300 rows
SELECT *
FROM
(SELECT rownum rn, x FROM paging_test ORDER BY x
) pt
WHERE pt.rn BETWEEN 300 AND 600 ;
您可能还对我的推荐信感兴趣:
参考资料:
NB的可能副本供将来参考:无需发布大量无关的SQL语句来询问分页问题。从emp中选择ename,rownum<300就足够了!我已经写了所有的sql语句,因为我已经尝试了与rownum的各种关联。。。然后从select rownum as rn中选择first_name,从select first_name中选择first_name,从某些_表中选择first_name,顺序为按first_name,其中rn>100和rn