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Sales doubled after a join in Tableau

Joining Orders to a Targets table at a coarser level physically duplicated rows and inflated SUM(Sales). What does Tableau's relationship (logical layer) model do differently?

A.It deletes duplicate rows automaticallyB.It averages all measures by defaultC.It only allows one table per data sourceD.It queries each table at its own level of detail

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Sales doubled after a join in Tableau

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