Context

Interviewers often ask this question to assess whether you can turn raw data into a clear recommendation, not just write queries. They want to hear how you framed the problem, analyzed the data, and influenced a customer decision.

Core question

Describe a recent project where you used SQL-based data analysis to help a customer make a decision. In your answer, explain:

1. What business question the customer needed answered
2. What data you analyzed and how you structured the SQL work
3. Which metrics or trends mattered most
4. What recommendation you made and why
5. What happened after the decision was made

Scope guidance

Keep the answer practical and structured. The interviewer is not looking for advanced database theory here. They want to hear a concise example showing basic SQL skills such as filtering, grouping, aggregation, and simple date-based analysis, plus your ability to communicate insights clearly to a non-technical stakeholder.