PDE Preparing and Using Data for Analysis Practice Question
A data engineer is building a Looker Studio dashboard that requires a calculated field to compute the running total of sales per day per store. Which Looker Studio function should they use?
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
✓
RUNNING_SUM()
Looker Studio's RUNNING_SUM function computes a running total within a group, exactly what is needed for a running total per store partitioned by date.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RANK()
Why it's wrong here
RANK assigns a rank, not a running total.
- ✗
TOTAL()
Why it's wrong here
TOTAL computes an overall total, not a running total.
- ✓
RUNNING_SUM()
Why this is correct
RUNNING_SUM computes cumulative sums.
- ✗
PERCENTILE()
Why it's wrong here
PERCENTILE calculates percentiles.
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