我正在研究将历史与投影相结合的存储过程。我有一个位列（PHP），指定投影是否优先于历史记录。我还有一个列，指定数据是来自历史记录还是投影表。我的存储过程的输出如下所示：
CaseId Year Projection PHP Gas Oil
1 2004 0 1
1 2005 0 1
1 2005 1 1
1 2006 1 1
1 2007 1 1
1 2008 1 1
1 2009 1 1
2 2003 0 0
2 2004 0 0
2 2005 0 0
2 2005 1 0
2 2006 1 0
2 2007 1 0
2 2008 1 0
2 2006 1 0
在这个例子中，我需要消除第二行，因为CaseId 1预测具有优先权，因此应该删除重叠的历史日期。此外，应删除CaseId 2的第四行，因为历史记录优先。
CaseId Year Projection PHP Gas Oil
1 2004 0 1
1 2005 1 1
1 2006 1 1
1 2007 1 1
1 2008 1 1
1 2009 1 1
2 2003 0 0
2 2004 0 0
2 2005 0 0
2 2006 1 0
2 2007 1 0
2 2008 1 0
2 2006 1 0
我需要在CaseId中标记重复年份，然后比较Projection和PHP列并删除它们不匹配的行。
以下是我正在使用的查询：
SELECT rcl.ReportRunCaseId AS CaseId,
year(rce.EcoDate) as Year,
1 as Projection,
cpq.ProjectionHasPrecedence as PHP,
rce.GrossOil as Oil,
rce.GrossGas as Gas
from phdreports.PhdRpt.ReportCaseList_28 rcl
inner join phdreports.PhdRpt.RptCaseEco_28 rce on
rce.ReportRunCaseId = rcl.ReportRunCaseId
inner join dbo.caseQualifier cq on
cq.CorpScenarioId = 1 and
cq.CaseCaseId = rcl.ReportRunCaseId and
cq.CorpQualifierTypeId = 1
inner join dbo.caseProjectionQualifier cpq on
cpq.CaseCaseId = rcl.ReportRunCaseId and
cpq.CorpQualifierId = cq.QualifierHasData
where rcl.ReportRunCaseId <=2
group by year(rce.EcoDate), rcl.ReportRunCaseId, cpq.ProjectionHasPrecedence, rce.GrossGas, rce.GrossOil
union all
select rmp.ReportRunCaseId AS CaseId,
year(rmp.EcoDate) as Year,
0 as Projection,
cpq.ProjectionHasPrecedence as PHP,
rmp.GrossOil as Oil,
rmp.GrossGas as Gas
from PhdReports.PhdRpt.RptMonthlyProduction_50 rmp
inner join dbo.caseQualifier cq on
cq.CorpScenarioId = 1 and
cq.CaseCaseId = rmp.ReportRunCaseId and
cq.CorpQualifierTypeId = 1
inner join dbo.caseProjectionQualifier cpq on
cpq.CaseCaseId = rmp.ReportRunCaseId and
cpq.CorpQualifierId = cq.QualifierHasData
where rmp.ReportRunCaseId <= 2
group by year(rmp.EcoDate), rmp.ReportRunCaseId, cpq.ProjectionHasPrecedence, rmp.GrossGas, rmp.GrossOil
如何消除Projection和PHP不匹配的重复年份？
答案 0 :(得分：2)
ROW_NUMBER（）函数应该在这里帮助你：
WITH Data AS
( SELECT rcl.ReportRunCaseId AS CaseId,
year(rce.EcoDate) as Year,
1 as Projection,
cpq.ProjectionHasPrecedence as PHP,
rce.GrossOil as Oil,
rce.GrossGas as Gas
from phdreports.PhdRpt.ReportCaseList_28 rcl
inner join phdreports.PhdRpt.RptCaseEco_28 rce on
rce.ReportRunCaseId = rcl.ReportRunCaseId
inner join dbo.caseQualifier cq on
cq.CorpScenarioId = 1 and
cq.CaseCaseId = rcl.ReportRunCaseId and
cq.CorpQualifierTypeId = 1
inner join dbo.caseProjectionQualifier cpq on
cpq.CaseCaseId = rcl.ReportRunCaseId and
cpq.CorpQualifierId = cq.QualifierHasData
where rcl.ReportRunCaseId <=2
group by year(rce.EcoDate), rcl.ReportRunCaseId, cpq.ProjectionHasPrecedence, rce.GrossGas, rce.GrossOil
union all
select rmp.ReportRunCaseId AS CaseId,
year(rmp.EcoDate) as Year,
0 as Projection,
cpq.ProjectionHasPrecedence as PHP,
rmp.GrossOil as Oil,
rmp.GrossGas as Gas
from PhdReports.PhdRpt.RptMonthlyProduction_50 rmp
inner join dbo.caseQualifier cq on
cq.CorpScenarioId = 1 and
cq.CaseCaseId = rmp.ReportRunCaseId and
cq.CorpQualifierTypeId = 1
inner join dbo.caseProjectionQualifier cpq on
cpq.CaseCaseId = rmp.ReportRunCaseId and
cpq.CorpQualifierId = cq.QualifierHasData
where rmp.ReportRunCaseId <= 2
group by year(rmp.EcoDate), rmp.ReportRunCaseId, cpq.ProjectionHasPrecedence, rmp.GrossGas, rmp.GrossOil
), Data2 AS
( SELECT *,
RowNum = ROW_NUMBER() OVER(PARTITION BY CaseId, Year
ORDER BY CASE WHEN PHP = Projection THEN 0 ELSE 1 END DESC, PHP DESC, Projection DESC)
FROM Data
)
SELECT CaseId, Year, Projection, PHP, Oil, Gas
FROM Data2
WHERE RowNum - 1;
仅考虑最后一位，因为第一位只是您在公共表表达式中的查询：
RowNum = ROW_NUMBER() OVER(PARTITION BY CaseId, Year
ORDER BY CASE WHEN PHP = Projection THEN 0 ELSE 1 END DESC, PHP DESC, Projection DESC)
在这里，我们给每个caseId，year元组一个等级，按PHP是否等于投影排序。然后最后一部分只是将结果限制为每个元组的第一行，所以如果存在一个等于它们的行，那么如果没有行，则它们相等，它们不相等的行将被使用。
您可能需要在订单中添加更多标准，以确保结果是确定性的，即如果同一caseId / Year有两行，其中PHP和投影都是1，请确保选择相同的行每一次。
答案 1 :(得分：1)
我不知道您的查询与该问题有什么关系。所以，我假设您有一个查询：
select CaseId, Year, Projection, PHP, Gas, Oil
from t
有了这个，你可以使用row_number()：
select CaseId, Year, Projection, PHP, Gas, Oil
from (select CaseId, Year, Projection, PHP, Gas, Oil,
row_number() over (partition by CaseId, Year
order by Projection + PHP desc
) as seqnum
from t
) t
where seqnum = 1;
这将根据设置的标志数量对行进行优先级排序。在CaseId = 2的示例中，这两行包含相同的值。这将返回其中一行。如果要在它们之间进行选择，则需要另一列，因此请指定优先级。