---
title: "Discussion on \"Mastering Recursive CTEs: The Missing Number Problem\" | Hashnode"
description: "Discussion on \"Mastering Recursive CTEs: The Missing Number Problem\". A step-by-step guide to solving a classic SQL technical interview question and identifying data gaps."
url: "https://hashnode.com/posts/mastering-recursive-ctes-the-missing-number-problem/68b288e4d9f087f50c19092c"
---

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# [Mastering Recursive CTEs: The Missing Number Problem](https://advance-sql.hashnode.dev/mastering-recursive-ctes-the-missing-number-problem?utm_source=hashnode&utm_medium=feed)

A step-by-step guide to solving a classic SQL technical interview question and identifying data gaps.

Aug 30, 2025 · 4 min read · advance-sql.hashnode.dev  
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## Written by

[Ardhendu Ghosh](https://hashnode.com/@ardhendughosh)

@ardhendughosh · India

  
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DYNAMIC

🧵 Stitching logic into data, culture into pixels, and clarity into workflows. I’m Ardhendu Ghosh—a systems architect in the making, blending SQL precision, annotation logic, and creative restoration into scalable, story-driven solutions. I build: 🧠 Reusable query modules for streaks, duplicates & classification 🎨 Emotionally attentive image enhancements (yes, even bindis matter) 📊 Dashboard-ready logic for annotation pipelines & public sharing ✍️ SEO-optimized content for Hashnode, LinkedIn & beyond If it’s repeatable, teachable, and culturally meaningful—I’m building it.

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