This repository documents my ongoing SQL practice and problem-solving journey across LeetCode and other coding platforms, showcasing continuous learning and skill development. It showcases structured solutions to a wide range of database challenges, including query optimization, data aggregation, window functions, joins, and advanced analytical techniques. The goal of this project is to strengthen my SQL proficiency, demonstrate clean and efficient query design, and build a practical portfolio reflecting real-world data analysis and BI development skills. Each solution emphasizes clarity, best practices, and performance-oriented thinking.