This article describes what weak relationships are and the differences between strong and weak relationship in Power BI and DAX.  Read more

The introduction of the weak relationships in Power BI composite models enables new data modeling techniques. However, not all of the many-to-many relationships can be managed by using weak relationship. The “classical” many-to-many relationships in data warehouse is a design…  Watch now

Activating bidirectional cross-filter in a Tabular data model might create ambiguous paths in the chain of relationships, resulting in very dangerous models as numbers become unpredictable. This article provides a deep explanation of the kind of ambiguity that might appear…  Read more

In the last few years, the Business Intelligence (BI) world has been moving towards self-service BI. As expected, several vendors created tools empowering regular users to gain insights from their data. Among the many, there is Power BI. Nowadays, users…  Read more

If you import more than one table into Power BI or Power Pivot, you have a data model. When you have more than one table, you usually have relationships between tables. When you analyze data, you often have many choices…  Read more

The Detail Rows Expression in a Tabular model provides the user with control over the drillthrough results obtained by showing details of a measure. This article describes typical DAX expressions you can use in this property.  Read more

This article introduces a technique to filter and productively compare two time periods with Power BI.  Read more

This article explains how DAX handles dependencies between tables, columns and relationships, to help you avoid circular dependency errors.  Read more

This article describes a number of techniques available to filter tables in DAX, showing possible pitfalls that you can avoid once you know them, in particular using bidirectional filters. One of the hardest things to do, when learning DAX, is…  Read more

The new DAX available in Excel 2016 and the data model in Power BI and Analysis Services 2016 offer tools to manage many-to-many relationships in a more efficient way than previous version, as described in this article.  Read more