010. Map Headers to Merge Files with POWER QUERY (List.Accumulate)

Map Headers to Merge Files with POWER QUERY: Many times, we can't trust the different departments that are filling Excel sheets! We often get different column orders and names. The issue with Power Query is that it would automatically know which header is for which data. Fortunately, there is a solution!
In this tutorial, we will use a mapping table and a function called List.Accumulate to go through the mapping table and assign the right header for each column in each file. Based on this Power Query will aggregate the data for us! Et Voila!
Link to Download the workbook: mega.nz/file/r...
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