LeetCode SQL Practice 🚀

This repository documents my daily SQL practice journey on LeetCode.
I’m solving SQL Problems and organizing them into clear learning stages to build SQL expertise step by step.

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🎯 Goals

• Strengthen SQL skills for Data Analyst / Data Engineer roles.
• Cover a broad range of SQL topics: joins, aggregations, grouping, filtering, subqueries, and window functions.
• Maintain a consistent practice routine with a public record of progress.

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📂 Repository Structure

• stage-1-core/ → Core Foundations (Joins & Aggregations)
• stage-2-grouping/ → Grouping & Filtering
• stage-3-advanced/ → Advanced Joins & Subqueries
• stage-4-window/ → Window Functions
• notes/ → Daily learnings, explanations, and reflections

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📈 Progress Tracker

• Day 1 →## Problems Solved

1. Combine Two Tables → 01_combine_two_tables.sql (E)
2. Employee Bonus → 02_employee_bonus.sql (E)
3. Duplicate Emails → 03_duplicate_emails.sql (E)
4. Customers Who Never Order → 04_customers_who_never_order.sql (E)

• (updated daily)

🔗 Profile

• https://leetcode.com/u/SundusAli/