Flat tables, star schemas, snowflakes, cardinality, filter direction, and Power Query joins, in plain language. My first Power BI report was a 12 column table. It worked until finance asked for actual vs budget, and I discovered a flat table can't share a customer or date across two business pr...
Source: [Dev.to](https://dev.to/victoria_fa8/relationships-schemas-and-joins-in-power-bi-a-practical-guide-to-data-modelling-335)