The Table That Lies
A medium Data Modeling mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Data Modeling
- Difficulty
- medium
- Seniority
- L5
Interview Prompt
Our operational database has a single wide table with one row per stylist-client session. It contains client attributes, stylist attributes, session metadata, and item-level details all flattened together. Analysts struggle to write correct queries against it and frequently produce wrong aggregations. Design a normalized data model to replace it.
Summary
Every query comes out wrong. The data is all there.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your data modeling solution with real code execution
- Get instant feedback and a hire/no-hire decision