How do you establish relationships between tables in Power BI?

Establishing relationships between tables in Power BI is primarily done through the "Manage Relationships" dialog. This feature provides a user-friendly interface where you can visually define how different tables relate to one another based on keys. Relationships are essential in a data model because they enable you to create a coherent view of data that may be spread across multiple tables.

When you use the "Manage Relationships" dialog, you can specify the type of relationship, such as one-to-many or many-to-many, and indicate which columns in different tables should be used to establish these links. This process enhances the model's ability to pull data from different sources in a meaningful and organized way, allowing for more effective reporting and analysis.

The other options, while related to data handling in Power BI, do not directly establish relationships. DAX queries are used for calculations and manipulating data rather than establishing connections. Importing tables simultaneously relates to how data is brought into Power BI, but it does not create relationships on its own. Exporting tables to other databases is a process for moving data out, not for defining connections within a Power BI model.