Câu 17: Salesforce Certified Tableau Consultant

A stakeholder has multiple files saved (CSV/Tables) in a single location. A few files from the location are required for analysis. Data transformation (calculations) is required for the files before designing the visuals. The files have the following attributes. All files have the same schema. Multiple files have something in common among their file names. Each file has a unique key column. Which data transformation strategy should the consultant use to deliver the best optimized result?

1. A. Apply the data transformation (calculations) in each required file and do the join to combine/merge before designing the visuals.
2. B. Use wildcard Union option to combine/merge all the files together before doing the data transformation (calculations). — đáp án hiện tại
3. C. Use join option to combine/merge all the files together before doing the data transformation (calculations).
4. D. Apply the data transformation (calculations) in each required file and do the wildcard union to combine/merge before designing the visuals.