What is M language at a conceptual level?

< 1 min read

M language is the formula language behind Power Query transformations in Power BI.
It records every step you apply in the Applied Steps pane.
Conceptually, it defines how data is extracted, cleaned, and shaped from source to model.
For example, filtering rows, renaming columns, or merging tables generates M code automatically.
We can also write custom M expressions for advanced logic or calculations.
It is functional and case-sensitive, designed for data preparation workflows.
M runs each time the query refreshes to produce consistent results.
It supports connecting to multiple sources and applying transformations in one sequence.
Understanding M helps troubleshoot, optimize, or customize complex queries.
So M language powers repeatable, automated, and flexible data transformation in Power BI.

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