Is it better to build a model as a regular star schema or as a single table in Power BI? The answer is clear: a star schema is always the best choice. This video analyzes the performance differences between the two approaches. Complete article: https://sql.bi/704257?aff=yt
How to learn DAX: https://www.sqlbi.com/guides/dax/?aff=yt
The definitive guide to DAX: https://www.sqlbi.com/books/the-definitive-guide-to-dax-2nd-edition/?aff=yt