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Costs of Relationships in DAX

SalesHeaderDetails-Schema

The relationships in a data model queried by DAX are a fundamental part of the engine and simplify the query itself. This article examines the cost of relationships in a data model, providing hints to optimize them.

Understanding ALLSELECTED

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ALLSELECTED looks like a special function that is able to understand what the user selected in the pivot table, retrieving the original filter context under which the pivot table is running. However, how it is possible that a DAX function knows what a user selected in a pivot table? If


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