DAX Functions, DirectQuery And Unrestricted Measures

If you use Power BI to connect to a data source such as SQL Server in DirectQuery mode, you’ll find that by default you cannot use the complete range of DAX functions inside your calculations. For example, here’s a screenshot from Power BI Desktop in DirectQuery mode with a measure where I’m trying to use the RankX() function:

Bron : Chris Webb’s BI Blog
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