Vibe codingMediumvc-g008

Subject Ai prompt specLevel Mid–Senior~15 minCommon in Databases & SQL interviewsIndustries Software development, Technology

Question

You want an AI agent to write a SQL query for a monthly-active-users report from an `events` table (columns: user_id, event_type, occurred_at) on Postgres. Write the prompt so the query is correct and not just plausible. What context and definitions must you supply, and where do vague analytics prompts go wrong?

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.