Tableau Desktop Foundations Practice Question

In Tableau, a data analyst drags the numeric field Customer ID into the view and sees that it appears as a blue pill on the Rows shelf, listed under Dimensions. Which explanation best describes why Tableau categorizes this field as a dimension?

Only fields stored as strings in the data source can be dimensions; Customer ID was automatically converted to text.
A field can act as a dimension when it contains fewer than 15 distinct values; beyond that it becomes a measure.
Tableau places any numeric field on Dimensions until the user explicitly changes its default aggregation to SUM.
Dimensions describe categorical, qualitative values used to slice or group data; Customer ID, though numeric, identifies customers rather than representing a quantity to be aggregated.

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Answer Description

Tableau assigns a field to Dimensions when the values are categorical labels that define how the data can be sliced or grouped. Customer ID is an identifier that distinguishes one customer from another; it does not represent a quantity that should be summed, averaged, or otherwise aggregated. Although the field is stored as numbers, its analytical role is qualitative. Numeric fields that convey quantitative size, amount, or magnitude-such as Sales or Profit-are placed in Measures because they are aggregated by default. The alternative statements are inaccurate: Tableau does not default numeric fields to Dimensions, does not silently convert them to text, and the number of distinct values does not determine whether a field is a dimension or measure.

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