You are modeling data in Power BI Desktop. The Customer table contains one row per CustomerID. The Orders table records many orders and includes the same CustomerID. Users must be able to select a customer in a slicer to filter order visuals, and also click an individual order row to highlight the related customer details. Which relationship configuration between Customer and Orders enables this behavior?
Many-to-one cardinality with a single cross-filter direction from Orders to Customer.
One-to-one cardinality with a Both cross-filter direction.
One-to-many cardinality with a single cross-filter direction from Customer to Orders.
One-to-many cardinality with a Both cross-filter direction.
Because each customer can have multiple orders, the appropriate cardinality is one-to-many (Customer is the one side, Orders the many side). To let filters flow in both directions-from customer to orders when a slicer is used, and from orders to customer when a row is selected-you must set the cross-filter direction to Both. A single-direction relationship only propagates filters from the one side to the many side, while a many-to-one relationship would be the wrong cardinality. A one-to-one relationship is also incorrect because multiple orders exist for each customer.
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Why would a one-to-one cardinality not work for this scenario?
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