- Power Query is a data preparation and transformation tool inside Power BI.
- It connects to multiple sources like SQL, Excel, APIs, or flat files.
- We clean, filter, and shape data before loading it into the model.
- In my project, we merged customer data from CRM with sales transactions.
- Columns were renamed, data types fixed, and nulls handled in Power Query.
- Derived columns and conditional transformations were created there.
- Text fields were cleaned, trimmed, and standardized for consistency.
- We applied filters to reduce dataset size and improve refresh performance.
- All steps are saved and reused automatically during scheduled refresh.
- So Power Query ensures raw data becomes clean, structured, and analysis-ready.
What is Power Query and its role in transformation?
Updated on February 9, 2026
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