DA0-002 Visualization and Reporting Practice Question
A data analyst is creating a dashboard in Tableau to show monthly sales trends. The data source includes daily sales figures. The analyst needs to calculate the cumulative sales for each month and compare it to the same period last year. Which Tableau feature should be used for the year-over-year comparison?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Table calculations
Tableau's table calculations can compute running totals and year-over-year comparisons without modifying the data source.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Calculated fields
Why it's wrong here
Calculated fields can compute year-over-year but require writing formulas manually.
- ✗
Level of Detail (LOD) expressions
Why it's wrong here
LOD expressions compute aggregations at different granularities but are not optimized for quick year-over-year calculations.
- ✓
Table calculations
Why this is correct
Table calculations can compute running total and date comparison (e.g., PREVIOUS_VALUE) easily.
- ✗
Parameters
Why it's wrong here
Parameters allow user input but do not directly compute year-over-year comparisons.
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