Bookends of the Week
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L4
Interview Prompt
A payments team is profiling how each week's spending clusters around its two edges, Monday and Sunday. For every week, give the percentage of that week's transaction volume that fell on Monday and the percentage that fell on Sunday, each rounded to the nearest whole number, earliest week first.
Summary
Every week has two edges. Weigh what lands on each.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision