Tableau Exam Desktop-Specialist Topic 2 Question 19 Discussion

In Tableau, you can aggregate measures or dimensions, though it is more common to aggregate measures. Whenever you add a measure to your view, an aggregation is applied to that measure by default. The type of aggregation applied varies depending on the context of the view.

When you add a measure to the view, Tableau automatically aggregates its values. Sum, average, and median are common aggregations; for a complete list, see List of Predefined Aggregations in Tableau.

The current aggregation appears as part of the measure's name in the view. For example, Sales becomes SUM(Sales). Every measure has a default aggregation which is set by Tableau when you connect to a data source. You can view or change the default aggregation for a measure---see Set the Default Aggregation for a Measure.

You can change the aggregation for a measure in the view from its context menu:

https://help.tableau.com/current/pro/desktop/en-us/calculations_aggregation.htm