Vibe codingHardvc-g109

Subject Ai code reviewLevel Senior–Staff~17 minCommon in Networking & APIs interviewsIndustries Software development

Question

An AI assistant implemented this SQL-backed pagination for an admin user list. QA found that while paging through results during active sign-ups, some users appear twice across pages and some are never shown, and deep pages (offset 200000) are very slow.

sql

1-- page N (1-indexed), 50 per page2SELECT id, email, created_at3FROM users4ORDER BY created_at DESC5LIMIT 50 OFFSET (:page - 1) * 50;

Explain both problems and the better design.

What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

Learn the concepts

Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.