Understanding Let Expressions In M For Power BI And Power Query

When you start writing M code for loading data in Power Query or Power BI, one of the first things you’ll do is open up the Advanced Editor for a query you’ve already built using the UI. When you do that you’ll see a very scary chunk of code (and at the time of writing there’s no intellisense or colour coding in the Advanced Editor, making it even more scary) and you’ll wonder how to make sense of it.

Bron : Chris Webb’s BI Blog
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