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I want to get a value from the previous row. I tried the following code as suggested in this post : Table.AddColumn(#"Added index", "custom column", each {[Index]-1}[column name]) But it throws this error: Cannot use field access fot type List Please help, what am I doing wrong? The error comes because {[Index]-1} without anything before it is a list value, but instead you want to index into a row of a table with this syntax: MyTable{index} That looks like: = Table.AddColumn(#"Added index", "custom column", each #"Added index"{[Index]-1}[My Column]) 来源： https://stackoverflow.com/questions

How to add index by category in M of Power BI with sorting by column. I look for equivalent of SQL: ROW_NUMBER() over(partition by [Category] order by [Date] desc Suppose we have a table: +----------+-------+------------+ | Category | Value | Date | +----------+-------+------------+ | apples | 3 | 2018-07-01 | | apples | 2 | 2018-07-02 | | apples | 1 | 2018-07-03 | | bananas | 9 | 2018-07-01 | | bananas | 8 | 2018-07-02 | | bananas | 7 | 2018-07-03 | +----------+-------+------------+ Desired results are: +----------+-------+------------+-------------------+ | Category | Value | Date | Index by

This question already has an answer here: Convert matrix to 3-column table ('reverse pivot', 'unpivot', 'flatten', 'normalize') 3 answers I have a table which records revenue for each product, split into type of revenue: price, fees, tax etc. To analyze the data I'd like to build a PivotTable to show the revenue breakdown, e.g.: So to build this PivotTable I need to somehow create an intermediate table of the following format so the PivotTable can be used: My question is, how do I create a PivotTable from the original table automatically without manually constructing the second table? Here are

If I have the following table (shown in the image below), how can I write a grouped query that would concatenate the grouped results? For this example, I'd want to group by the LetterColumn and concatenate the NumberColumn So the desired results would be: If your table is Source, and if NumberColumn has the number type, then this will work: = Table.Group(Source, {"LetterColumn"}, {{"Column", each Text.Combine(List.Transform(_[NumberColumn], (x) => Number.ToText(x)), ","), type text}}) Table.Group does a group by operation, which creates a table made up of all of the rows with the same value in

I'm having multiple PowerQuery queries that I would like to feed the value of a cell in my Excel file. In this particular case, the full path to the sourcefile name. Is there any way I can get this into PowerQuery? Peter Albert This can be achieved using a named range and a custom function in PowerQuery: Name the cell you need to refer (type in a name into the file left of the formula bar) - e.g. SourceFile Insert a new blank PowerQuery query (PowerQuery ribbon -> From other sources) In the PowerQuery editor, go to View -> Advanced Editor and paste the following code; (rangeName) => Excel