Question

I have the following query:

-- 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

Which brings up the following results:

Unfortunately one our reports changed names throughout the month and subsequently I need to merge these two rows. Is this possible? How can I merge two rows? For example, how could I have the first and second row show additive results using the first rows report name?

Answer 1

If I understood it well you just need a case statement in your select and in your group by.. something like

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

if your case is that now is Project 1 and one month ago was Project 2, you may need to add the date in the case statement (just in case)

 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

That’s the idea.

Edit.

I think you have an option if they get repeated but I dont really like it at all

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