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3.3.1. Power Query (M) Transformations
💡 First Principle: Power Query (M) is a functional language optimized for data transformation, powering both Dataflow Gen2 and Power BI data preparation. It excels at visual, no-code transformations but struggles with massive datasets or complex logic.
Common M Transformations
| Operation | M Function | Purpose |
|---|---|---|
| Filter rows | Table.SelectRows | Remove unwanted records |
| Remove columns | Table.RemoveColumns | Eliminate unneeded columns |
| Merge queries | Table.NestedJoin | Join tables together |
| Group by | Table.Group | Aggregate data |
| Pivot | Table.Pivot | Transform rows to columns |
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Written byAlvin Varughese
Founder•20 professional certifications