How to consolidate rows of data in excel - excel

Question

I am trying to consolidate rows when they have the same ID, Order, and Class. However, the consolidated row needs sum the length, AND input the correct begin and end. So the consolidated row will have the begin value of the first row, and the end value of the last row Please check the image to see what I mean.
I'm pretty sure I can achieve the summing of the length using SUMIF, but I can't figure out how to input the correct begin and end values into the consolidated row.
Is this even possible with excel? I can't use pivot tables because I'm not simply trying sum the length, I want the columns to remain the same, just to consolidate the rows accordingly. Any help will be much appreciated!
The left is what I have, the right is what I am trying to achieve:

Answer 1

In your example, it seems the begin and end that you want are the min and max respectively, and I used that in the approach.
Relatively simple to do with Power Query, which is available in Excel 2010+.
Select the ID, Order and Class columns
Group By
For Aggregations have min of begin; max of end; and sum of length
Move the Class column back to the end
Voila!
This can all be done quickly from the UI
M-Code
let
Source = Excel.CurrentWorkbook(){[Name="Table7"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Order", Int64.Type}, {"begin", Int64.Type}, {"end", Int64.Type}, {"length", Int64.Type}, {"class", Int64.Type}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"ID", "Order", "class"}, {{"Begin", each List.Min([begin]), type number}, {"End", each List.Max([end]), type number}, {"Length", each List.Sum([length]), type number}}),
#"Reordered Columns" = Table.ReorderColumns(#"Grouped Rows",{"ID", "Order", "Begin", "End", "Length", "class"})
in
#"Reordered Columns"
For completeness: If, perchance, you really need to use the First and Last Rows within each group for Begin and End, instead of Min/Max, you can use the following code.
In the group by step, instead of aggregating begin/end by max/min, you choose an aggregation of All Rows. This will create a table which includes the begin and end entries for each group. You can then extract the first and last entries using the List.First and List.Last functions.
The code for the custom columns:
List.First(Table.Column([#"Start/End"],"begin"))
List.Last(Table.Column([#"Start/End"],"end"))
M-Code
let
Source = Excel.CurrentWorkbook(){[Name="Table7"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Order", Int64.Type}, {"begin", Int64.Type}, {"end", Int64.Type}, {"length", Int64.Type}, {"class", Int64.Type}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"ID", "Order", "class"}, {{"Length", each List.Sum([length]), type number}, {"Start/End", each _, type table [ID=number, Order=number, begin=number, end=number, length=number, class=number]}}),
#"Added Custom" = Table.AddColumn(#"Grouped Rows", "Begin", each List.First(Table.Column([#"Start/End"],"begin"))),
#"Added Custom1" = Table.AddColumn(#"Added Custom", "End", each List.Last(Table.Column([#"Start/End"],"end"))),
#"Removed Columns" = Table.RemoveColumns(#"Added Custom1",{"Start/End"}),
#"Reordered Columns" = Table.ReorderColumns(#"Removed Columns",{"ID", "Order", "Begin", "End", "Length", "class"})
in
#"Reordered Columns"
By the way, you can come pretty close with a regular Pivot Table (especially if you can use Min/Max for the begin/end). It's not as flexible, though, and I don't think you can order the columns the way you have shown.
Below is a simple pivot table.
You drag ID, Order and class to the Rows area.
You drag Begin, End and Length to the Values area applying Min, Max and Sum.
Then Show the layout in Tabular form; turn off the grand totals and subtotals, and you have:

Answer 2

Option with formulas - in the simplest way, copy the table to a new location and use Remove duplicates to leave unique values in the Id, Order, and Class columns. Next fill the columns with the following formulas:
Begin (array formula):
{=INDEX($C$2:$C$9,MIN(IF(($A$2:$A$9=H2)*($B$2:$B$9=I2)*($F$2:$F$9=M2),ROW($A$2:$A$9)-MIN(ROW($A$2:$A$9))+1)),0)}
End (array formula):
{=INDEX($D$2:$D$9,MAX(IF(($A$2:$A$9=H2)*($B$2:$B$9=I2)*($F$2:$F$9=M2),ROW($A$2:$A$9)-MIN(ROW($A$2:$A$9))+1)),0)}
Length (conventional formula):
=SUMPRODUCT($E$2:$E$9*($A$2:$A$9=H2)*($B$2:$B$9=I2)*($F$2:$F$9=M2))
Array formulas after editing is confirmed by pressing ctrl + shift + enter