Question

我有许多不同的投资组合，每个投资组合都有自己的ID，而且这是带有run_id的风险编号

我想要做的是每个日期，拉出与每个投资组合的最大run_id链接的Bps号码

select analysis_date,ptf_id,stat_name,Bps,run_id
from rpt.rm_Report_History 
where analysis_date > '20160102' and criteria_Set= 'Daily' 
and ptf_id in( '10038','10039')
and report_section_group = 'Key_Risk_Figures'
and rm_rcp_param_name = 'Fund'
and stat_class = 'standaloneVaR'

，它提供以下输出

output

Answer 1

这是一个带有子选择的解决方案，该子选择首先确定列表中的max run_id，然后选择具有条件AND max run_id的所有行。由于列不是唯一的，因此您可以使用GROUP BY修饰符删除多个匹配项。

这是一个经典的最小/最大群体问题。有些DBMS有更好的解决方案，但下面的那个可能适用于大多数系统。

select analysis_date,ptf_id,stat_name,Bps,run_id
from rpt.rm_Report_History 
where analysis_date > '20160102' and criteria_Set= 'Daily' 
and ptf_id in( '10038','10039')
and report_section_group = 'Key_Risk_Figures'
and rm_rcp_param_name = 'Fund'
and stat_class = 'standaloneVaR'
and run_id = (SELECT max(run_id) FROM rpt.rm_Report_History WHERE
    analysis_date > '20160102'
    and criteria_Set= 'Daily' 
    and ptf_id in( '10038','10039')
    and report_section_group = 'Key_Risk_Figures'
    and rm_rcp_param_name = 'Fund'
    and stat_class = 'standaloneVaR')
GROUP BY run_id

编辑：某些DBMS将要求您按所有选定的列进行分组：

...
GROUP BY analysis_date,ptf_id,stat_name,Bps,run_id

Answer 2

我将假设tsql你的意思是SQL服务器......在这种情况下，抛出一个row_number（） - 我最喜欢的SQL工具中的工具

select A1.*
from
(
select analysis_date,ptf_id,stat_name,Bps,run_id, row_number() over(partition by ptf_id order by run_id desc) as Run_Order
from rpt.rm_Report_History 
where analysis_date > '20160102' and criteria_Set= 'Daily' 
and ptf_id in( '10038','10039')
and report_section_group = 'Key_Risk_Figures'
and rm_rcp_param_name = 'Fund'
and stat_class = 'standaloneVaR' ) A1
where A1.Run_Order = 1

Answer 3

这是使用cte的实现（适用于sql server 2008及更高版本）。

;with cte_1
as
(select analysis_date,ptf_id,stat_name,Bps,run_id,ROW_NUMBER() OVER(PARTITION BY ptf_id ORDER BY run_id desc) as RNO
from rpt.rm_Report_History 
where analysis_date > '20160102' and criteria_Set= 'Daily' 
and ptf_id in( '10038','10039')
and report_section_group = 'Key_Risk_Figures'
and rm_rcp_param_name = 'Fund'
and stat_class = 'standaloneVaR')

SELECT *
FROM cte_1
WHERE RNO=1

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