Which function is NOT useful for performing data aggregations in Tableau?

The function that is not useful for performing data aggregations in Tableau is CLONE(). This is primarily because CLONE() is not a recognized or standard aggregation function within Tableau’s capabilities. In contrast, functions such as SUM(), COUNT(), and AVG() are foundational aggregation functions widely used to summarize data in various contexts.

SUM() allows users to calculate the total of a numerical field, COUNT() provides the total number of entries in a field, whether they are numeric or categorical, and AVG() computes the average value of a numerical field. Each of these functions directly supports analytical needs related to data summarization, allowing users to derive meaningful insights from their datasets.

Thus, understanding the purpose and function of common aggregation methods in Tableau is key, as these functions enable analysts to perform essential data analysis tasks efficiently.