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Write a Cohort Retention Query That Doesn't Secretly Double-Count Users

Data SQL Advanced 🤖 ChatGPT 👁 4 views

📝 The Prompt

I need a SQL cohort retention query that groups users by their signup week and shows the percentage retained at week 1, 2, 4, 8, and 12. Our events table has multiple rows per user per day (each action is a row), and users can sometimes appear with two different IDs if they sign up again — I have a user_id_canonical column for that. Write the query in PostgreSQL, explain how the joins prevent double-counting, and show me three test queries I can run on a single known cohort to sanity-check the numbers before I trust the rollup. Also tell me what the query will quietly get wrong if I forget to filter for is_internal_user = false.

🎯 What this prompt does

This AI prompt helps you write a cohort retention query that doesn't secretly double-count users. Designed for sql workflows in the data category, it's a advanced-level prompt you can copy directly into ChatGPT to get instant, production-ready results.

Use it when you need a advanced prompt that produces clear, actionable output without wrestling with trial-and-error wording. Just copy, customize, and run.

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🚀 How to use this prompt

  1. Copy the prompt using the 📋 button above.
  2. Open ChatGPT (or Claude, Gemini, Perplexity, or your preferred LLM).
  3. Paste the prompt into a new chat. Add any extra context about your situation if helpful.
  4. Run the prompt and review the AI's response. Most outputs are usable immediately.
  5. Iterate if needed — if the tone, length, or structure isn't quite right, reply with "make it shorter", "use bullet points", or "make it more formal" and the AI will refine it.

💡 Tips for better results

  • Tailor the prompt to your specific context — the more detail you give, the better the output.
  • If the first output isn't quite right, ask the AI to refine, rewrite, or add more detail — iteration is key.
  • For long outputs, ask for a section at a time (e.g. 'start with the introduction only') to keep quality high.
  • Combine this with other data prompts to build an end-to-end workflow.
  • Save your favorite variations — small wording tweaks often produce noticeably different results.
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✨ What you'll get

When you run this prompt, expect ChatGPT to return:

  • A directly usable sql output tailored to the details you provided
  • Clear structure (headings, bullets, or numbered sections) that you can drop into your workflow
  • Content that matches your specified tone and context
  • Results in under 30 seconds — no manual drafting required

Need a different angle? Just ask follow-up questions. The AI will adjust without you starting over.

🔄 3 variations to try

1

Make it more formal

Add "Use a formal, professional tone suitable for enterprise clients" at the start of the prompt.

2

Ask for multiple options

Append "Give me 5 alternative versions, each with a different angle or approach." after the main instruction.

3

Request structured output

Add "Return the response as a markdown table (or bullet list, or JSON)" so you can paste the result directly into your docs or code.

🏷 Tags

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