2 u010463375 u010463375 于 2013.07.02 12:57 提问

求帮助,oracle数据库,查询出每个最新时间的那一条数据

select p.* from (select rownum as 序号 ,n.* from (select sitename as 站点名称, RecordTime as 记录时间 ,decode(avg(case item when 211 then value else null end),0,'0.00000',trim(to_char(avg(case item when 211 then value else null end),'99999999999990.99999'))) "SO2(mg/m3)" from(select s.sitename,m.* from air_temphourdata m left join site s on m.sitecode=s.sitecode where m.SiteCode in ('34656-31102001','34656-31102006'))group by sitename,Recordtime having to_char(Recordtime,'yyyymmddhhmmss')=MAX(to_char(Recordtime,'yyyymmddhhmmss')) order by RecordTime desc ) n )p where p.序号 between 1 and 15 只查询出每个站点最大时间的那一条

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