Power Query

Power Query M Formula Language

API and language reference for the M formula language used in Power Query for data transformation expressions and custom functions.

GitHub

Documentation

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Documentation
https://docs.microsoft.com/en-us/powerquery-m/
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APIReference
https://docs.microsoft.com/en-us/powerquery-m/power-query-m-function-reference
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GettingStarted
https://learn.microsoft.com/en-us/powerquery-m/quick-tour-of-the-power-query-m-formula-language