You drag the measure Sales onto the Marks card, showing a single value. Afterward, you place the dimension Region on Rows. How does Tableau recalculate the Sales values once Region is added to the view?
It changes the aggregation to AVG, showing the mean Sales for each Region.
It creates a separate SUM of Sales for every individual Region in the data.
It removes aggregation and displays every row-level Sales value within each Region.
It multiplies each Sales value by the number of records in its Region.
Tableau always aggregates measures before displaying them. By default, the aggregation applied to numeric measures like Sales is SUM. When a new dimension such as Region is added, Tableau partitions the data by that dimension and re-applies the default aggregation to each partition. Therefore, it produces one sum of Sales for every Region. Choosing AVG would require manually changing the aggregation, multiplication is never an aggregation option, and showing raw row-level values would occur only if the aggregation were turned off, which Tableau does not do automatically.
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