The Split feature in Tableau Prep is the most efficient tool for this task. The Orderld field has a consistent structure where components (Country, Year, Order Number) are separated by a hyphen (-). The Split function can use this delimiter to automatically parse the single field into three distinct fields in one operation. This built-in functionality is significantly faster and requires fewer steps than manually creating multiple calculated fields with complex string functions, directly addressing the need for the "most efficient manner."

A. A calculated field that uses the TRIM function: The TRIM function is incorrect as it only removes leading and trailing spaces from a string; it cannot separate the string into multiple parts.

B. A calculated field that uses the LEFT function: While possible, using LEFT (along with MID, RIGHT, and FIND) to create calculated fields is inefficient, requiring multiple complex formulas instead of a single, simple operation.

D. The Aliases option: The Aliases option is incorrect because it is used to rename specific member values within a field (e.g., changing "US" to "United States"), not to restructure data by splitting a column.

1. Tableau Prep Help - Split a Field into Multiple Fields: "If your data includes fields that contain multiple units of information

you can split the values in the field into new fields. For string values

you can split the data using the built-in split options or create a custom split. Tableau Prep Builder can automatically detect the common separator and split the field for you." This directly supports using the Split option for the given scenario.

Source: Tableau Official Documentation

"Split a Field into Multiple Fields".

2. Tableau Prep Help - Create Calculated Fields in Tableau Prep: This document outlines the process for creating calculated fields. While it lists functions like LEFT

RIGHT

and TRIM

the process of using them to parse a string is multi-step and complex compared to the dedicated Split feature

making it less efficient.

Source: Tableau Official Documentation

"Create Calculated Fields in Tableau Prep".

3. Tableau Prep Help - Edit Field Values: This document explains the use of Aliases. "You can directly edit a value in a field or use Find and Replace to replace multiple values... This is similar to creating an alias in Tableau Desktop." This confirms that Aliases are for renaming values

not splitting columns.

Source: Tableau Official Documentation

"Edit Field Values".