Power Query to Dynamically Select First and Last Column

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legalhustler

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  1. 365
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In Power Query, I have a step where the column "Custom" stores "table" values and if I click the expand button it allows me to manually select the columns I want to show, but how can I dynamically select just the first and last columns only of the "table" values?
 

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I used the following (it accounts if there is a single column within the table values and return just that otherwise it returns the first and last columns)

Power Query: 
= Table.AddColumn(PreviousStep, "NewColumnName", each Table.SelectColumns([Custom],if Table.ColumnCount([Custom])=1 then {Table.ColumnNames([Custom]){0}} else {Table.ColumnNames([Custom]){0},Table.ColumnNames([Custom]){Table.ColumnCount([Custom])-1}}))
 
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legalhustler said:
I used the following (it accounts if there is a single column within the table values and return just that otherwise it returns the first and last columns)

Power Query: 
= Table.AddColumn(PreviousStep, "NewColumnName", each Table.SelectColumns([Custom],if Table.ColumnCount([Custom])=1 then {Table.ColumnNames([Custom]){0}} else {Table.ColumnNames([Custom]){0},Table.ColumnNames([Custom]){Table.ColumnCount([Custom])-1}}))
Click to expand...

Ok - I need help making a small adjustment. How do I modify this formula so that when the last column is returned it's renamed to Column2? Obviously the first column will always be Column1 so that doesn't need to change, only the last column if it's not already named Column2

Power Query: 
Table.SelectColumns([Custom],if Table.ColumnCount([Custom])=1 then {Table.ColumnNames([Custom]){0}} else {Table.ColumnNames([Custom]){0},Table.ColumnNames([Custom]){Table.ColumnCount([Custom])-1}})
 
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Cross posted at:

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Dynamically Select the First and Last Column
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There is no need to repeat the link(s) provided above but if you have posted the question at other places, please provide links to those as well.

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