What is grouping and aggregation during transformation?

< 1 min read

Grouping and aggregation means combining rows based on one or more columns and calculating summary values.
In my project, we grouped sales by Region to get total Revenue per region.
Aggregations include SUM, AVG, COUNT, MIN, MAX, or custom calculations.
Power Query allows grouping before loading into the model to reduce dataset size.
We also created counts of orders per customer or per product category.
It helps generate summary tables for KPIs and dashboards.
Grouping can be combined with filtering or sorting for focused analysis.
Applied early in transformation improves performance and reduces processing in visuals.
It ensures consistent metrics and simplifies reporting logic.
So grouping and aggregation prepares data for meaningful business insights.

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