Platform Speed
A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
The product team is investigating whether device type affects how long users stay engaged. For each device type with enough logged sessions to compare fairly, show the typical session length, the longest single session on record, and how many sessions were logged.
Summary
Which devices keep users longest?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision