Advanced SQL Practice

Live site (GitHub Pages): https://santoshkhatri9860.github.io/advanced-sql-practice-mysql/
Exercise Index: https://github.com/santoshkhatri9860/advanced-sql-practice-mysql/blob/main/exercises/README.md
Quickstart (setup + smoke test): https://github.com/santoshkhatri9860/advanced-sql-practice-mysql/blob/main/docs/QUICKSTART.md

A practice-first SQL workbook with 1,400+ topic-wise questions — from fundamentals to advanced patterns — built for job prep, interviews, and real-world SQL fluency.

Most sites explain advanced SQL concepts, but don’t provide enough structured, high-volume practice. This repo is designed to fix that: prompts first, then separate solutions so you can practice properly and verify fast.

Best for: learners • job seekers • interview prep • anyone leveling up SQL

---

What you’ll practice

• Subqueries + EXISTS
• Correlated subqueries
• Window functions (aggregate, ranking, frames)
• LAG() / LEAD()
• CTEs (non-recursive + multi-CTE)
• Recursive CTEs (numbers + employee hierarchy)
• Date/Time functions

---

Repo structure

• exercises/ → prompts-only (try first)
• solutions/ → complete solutions (reference after)
• db/ → local DB setup + seed scripts
• docker-compose.yml → optional local MySQL setup
• docs/ → how to use + roadmap + style guide
• archive/ → original work preserved without changes

---

Quick start

1. Read: docs/HOW_TO_USE.md
2. Start practicing: exercises/README.md
3. Check your work: solutions/

Want a local database with sample data? See db/ (Docker is optional).

---

Recommended learning path

1. Subqueries
2. EXISTS + correlated subqueries
3. Window functions (ROW_NUMBER, RANK/DENSE_RANK)
4. Window frames
5. LAG/LEAD
6. CTEs
7. Recursive CTEs
8. Date/Time patterns

---

Who this is for

• Beginners who know basic SQL and want to level up with real practice
• Data analysts preparing for SQL interviews
• Anyone who wants a structured workbook instead of random questions

---

Notes

• MySQL 8+ recommended (for CTEs + window functions).
• SQL often has multiple correct answers — solutions are reference implementations.

---

Support

If this repo helps you practice SQL, consider starring it ⭐ — it helps more learners discover it.