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Converting a flat table to a good data model in Power Query

The article discusses the process of converting a wide Excel table into a good data model in Power BI. It emphasizes the benefits of a “good” data model and provides a step-by-step guide on how to achieve it, including identifying dimension tables, cleaning and restructuring the data, and building relationships. The author advocates for utilizing a star schema for efficient data modeling. For more details, please refer to the original article.

 Converting a flat table to a good data model in Power Query

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Converting a Flat Table to a Good Data Model in Power Query

Introduction

When loading a wide Excel table into Power BI, we often end up with a suboptimal data model. But what can we do to create a good data model, and why is it important?

Why a Good Data Model?

A good data model can significantly improve efficiency and usability. By separating data into separate tables and connecting them with relationships, Power BI can work more efficiently and reduce file size by removing redundancies. This enables easy access to all columns grouped in separate tables, making it more user-friendly.

What is a Good Data Model?

A good data model is a Star Schema. This involves moving certain columns into separate tables to create shorter, more distinct tables, resulting in a more organized and efficient data model.

Practical Steps

1. Find columns with low cardinality and group them.
2. Define names for each Dimension table.
3. Replace all empty cells.
4. Duplicate the table with the data and perform necessary data preparations in Power Query.

Final Result

The final data model is a clean Star Schema with improved efficiency and usability. Although the resulting file may be slightly larger, the benefits in terms of organization and usability far outweigh the increase in file size.

Conclusion

Creating a good data model may require some effort, but it is well worth exploring to achieve a better solution in Power BI. By optimizing the data model, companies can benefit from improved performance and user experience.

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Vladimir Dyachkov, Ph.D
Editor-in-Chief itinai.com

I believe that AI is only as powerful as the human insight guiding it.

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