How do efficient Power BI developers handle complex data transformations?

Efficient Power BI developers leverage Power Query for complex data transformations, combining automation with precision. They clean, filter, and transform datasets using M scripting, reducing manual intervention. Query folding is optimized to push transformations to the source, improving performance. For repetitive tasks, Power BI developers use templates and reusable queries. They document every step for transparency and future updates. When necessary, external tools like Python or R are integrated for advanced transformations. These approaches enable developers to transform complex data into structured, actionable formats while maintaining efficiency and accuracy.