ETL with Power Query: Import, Transform, and Load Data Efficiently

What is ETL?

ETL stands for Extract, Transform, Load — a process used to gather data from various sources, clean and shape it, and load it into a target system like a data warehouse or a Power BI data model.

ETL in Power BI with Power Query

Power BI performs ETL operations using Power Query Editor, which is a built-in tool for data preparation.

1. Extract (E)

Get Data

  • You pull data from various sources like Excel, SQL Server, SharePoint, Web APIs, Azure, etc.

  • In Power BI: Click Home > Get Data to import your data.

2. Transform (T)

Clean and Shape Data

  • This is the core strength of Power Query.

  • You can:

    • Filter rows (e.g., remove nulls)

    • Rename columns

    • Merge or split columns

    • Change data types

    • Unpivot or pivot data

    • Remove duplicates

    • Create custom columns using M code

  • Every action becomes a step in the query, which is repeatable and refreshable.

3. Load (L)

Push Data to Power BI Model

  • After transformation, load the clean data into Power BI’s data model.

  • This data is now ready for creating visuals, measures, and reports.

  • You can also load it to Power BI Dataflows if building centralized models.

 Example:

Suppose you have messy Excel files from five departments. Using Power Query, you can:

  • Extract all files from a folder,

  • Merge them into a single table,

  • Remove duplicates and correct date formats,

  • Then load the cleaned dataset into Power BI for dashboarding.

Key Benefits of ETL in Power Query:

  • No need for external ETL tools for many cases.

  • Visual interface, no-code/low-code.

  • Reusable and refreshable queries.

  • Seamless integration with Power BI.


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