LeetCode SQL

LeetCode provides SQL practice problems as part of its broader coding interview preparation platform. Free tier with limited problem access; Premium at $35/month (annual) unlocks all problems and company tags. Database problems (~200+) range from easy to hard with focus on algorithmic SQL patterns: ranking, running totals, gaps and islands, recursive queries. Each problem includes sample data, expected output, and performance requirements. Premium features include company tags showing which companies ask specific problems and frequency data. Discussion section contains multiple solution approaches with performance analysis. The platform emphasizes correctness and optimization, solutions are tested and timed against large datasets. No AI features, traditional problem-based practice. Best suited for software engineers preparing for coding interviews that include SQL components. Page should cover: SQL problem categories, difficulty distribution, Premium features value, comparison with StrataScratch and HackerRank, platform limitations for SQL, and interview preparation approach.