Advanced SQL Interview Drills: FLOOR 3
The top floor. Ten minutes per problem, and every question looks like something a senior analyst actually ships.
Mission briefing
Floor 3 is advanced SQL interview practice: multi-stage analytics problems with ten-minute timers. Compute operative retention rates by recruitment year. Measure quarter-over-quarter threat growth. Derive a median clearance when there is no median function. Map second-degree connections, the contacts of contacts, in an enemy network. Route logistics across warehouses and find the busiest corridors.
Each case chains dependent stages, so a wrong early answer costs real clock time. The countdown comes from the server, so there is no pausing. This is the pressure profile of a final-round data interview.
If you clear this floor comfortably, you are ready for the real thing.
For the full format, timers, and scoring details, see the Interview Mode page.
Related guides
Free guides that pair well with this chapter:
Play Floor 3 now
Free in your browser, desktop only. Guest mode starts instantly with no signup; sign in with Google if you want progress saved across devices.