sql - 如何合并结果中的两行而不是所有结果？

Question

我有以下查询:

-- Compare current period to historical data
select  Name ,
        avg(TimeProcessing + TimeRendering + TimeDataRetrieval) / 1000  as 'Current Month' ,
        isnull(count(TimeProcessing), 0)                                as 'Sample' ,
        min(l2.[Avg_Exec_Time_Previous_Month])                          as 'Previous Month' ,
        isnull(min(l2.[Executions_Last_Month]), 0)                      as 'Sample' ,
        min(l3.[Avg_Exec_Time_Two_Months_Ago])                          as 'Two Months ago' ,
        isnull(min(l3.[Executions_Two_Months_Ago]), 0)                  as 'Sample'
from    marlin.report_execution_log l
        inner join marlin.report_catalog c on l.ReportID = c.ItemID
        left outer join ( 
                        select    
                            l2.ReportID ,
                            (
                            avg(l2.TimeProcessing + l2.TimeRendering 
                            + l2.TimeDataRetrieval) / 1000 
                            ) as 'Avg_Exec_Time_Previous_Month' ,
                            count(l2.TimeProcessing) as 'Executions_Last_Month'
                        from    
                            marlin.report_execution_log l2
                        where   
                            TimeEnd between dateadd(MONTH, -2, getdate())
                                    and     dateadd(MONTH, -1, getdate())
                        group by  
                            l2.ReportID
                        ) l2 on l.ReportID = l2.ReportID
        left outer join ( 
                        select    
                            l3.ReportID ,
                            (
                            avg(l3.TimeProcessing + l3.TimeRendering + l3.TimeDataRetrieval) / 1000 
                            ) as 'Avg_Exec_Time_Two_Months_Ago' ,
                            count(l3.TimeProcessing) as 'Executions_Two_Months_Ago'
                        from  
                            marlin.report_execution_log l3
                        where 
                            TimeEnd between dateadd(MONTH, -3, getdate())
                                    and     dateadd(MONTH, -2, getdate())
                        group by  
                            l3.ReportID
                        ) l3 on l.ReportID = l3.ReportID
group by    l.ReportID ,
            Name
order by    2 desc

这带来了以下结果:

不幸的是，我们的一份报告在整个月内更改了名称，随后我需要合并这两行。这可能吗？如何合并两行？例如，如何使用第一行报告名称让第一行和第二行显示附加结果？

Answer 1

如果我理解得很好，你只需要在你的选择和你的组中有一个案例陈述......就像

select  case when Name = 'Project1' then 'Project1'
             when Name = 'Project2' then 'Project1'
             else Name
        end as NAME
.......
group by case when Name = 'Project1' then 'Project1'
             when Name = 'Project2' then 'Project1'
             else Name
        end

如果你的case是现在是Project 1，一个月前是Project 2，你可能需要在case statement中加上日期(以防万一)

 select  case when Name = 'Project1' and TimeEnd = getdate()  then 'Project1'
                 when Name = 'Project2' and TimeEnd = dateadd(MONTH, -1, getdate()) then 'Project1'
                 else Name
            end as NAME
    .......
    group by case when Name = 'Project1' and TimeEnd = getdate()  then 'Project1'
                 when Name = 'Project2' and  TimeEnd = dateadd(MONTH, -1, getdate()) then 'Project1'
                 else Name
        end

就是这个想法。

编辑。

我认为如果他们重复出现，您可以选择，但我一点都不喜欢

SELECT NAME, AVG(Current Month) as Current Month, count(Sample) as Sample, min(Previous Month) as Previous Month, min(Sample2) as Sample2, min(Two Months ago) as Two Months ago,
min(Sample3) as Sample3
FROM
(
select  Name ,
        avg(TimeProcessing + TimeRendering + TimeDataRetrieval) / 1000  as 'Current Month' ,
        isnull(count(TimeProcessing), 0)                                as 'Sample' ,
        min(l2.[Avg_Exec_Time_Previous_Month])                          as 'Previous Month' ,
        isnull(min(l2.[Executions_Last_Month]), 0)                      as 'Sample2' ,
        min(l3.[Avg_Exec_Time_Two_Months_Ago])                          as 'Two Months ago' ,
        isnull(min(l3.[Executions_Two_Months_Ago]), 0)                  as 'Sample3'
from    marlin.report_execution_log l
        inner join marlin.report_catalog c on l.ReportID = c.ItemID
        left outer join ( 
                        select    
                            l2.ReportID ,
                            (
                            avg(l2.TimeProcessing + l2.TimeRendering 
                            + l2.TimeDataRetrieval) / 1000 
                            ) as 'Avg_Exec_Time_Previous_Month' ,
                            count(l2.TimeProcessing) as 'Executions_Last_Month'
                        from    
                            marlin.report_execution_log l2
                        where   
                            TimeEnd between dateadd(MONTH, -2, getdate())
                                    and     dateadd(MONTH, -1, getdate())
                        group by  
                            l2.ReportID
                        ) l2 on l.ReportID = l2.ReportID
        left outer join ( 
                        select    
                            l3.ReportID ,
                            (
                            avg(l3.TimeProcessing + l3.TimeRendering + l3.TimeDataRetrieval) / 1000 
                            ) as 'Avg_Exec_Time_Two_Months_Ago' ,
                            count(l3.TimeProcessing) as 'Executions_Two_Months_Ago'
                        from  
                            marlin.report_execution_log l3
                        where 
                            TimeEnd between dateadd(MONTH, -3, getdate())
                                    and     dateadd(MONTH, -2, getdate())
                        group by  
                            l3.ReportID
                        ) l3 on l.ReportID = l3.ReportID
group by    l.ReportID ,
            Name
)
group by  Name
order by    2 desc