Leetcode HARD 3368 - Recursive CTE Trick That Solves Hardest String Problem | SQL Tutorial

Question: https://leetcode.com/problems/first-l... SQL Schema: CREATE TABLE If not exists user_content ( content_id INT, content_text VARCHAR(255) ) Truncate table user_content insert into user_content (content_id, content_text) values ('1', 'hello world of SQL') insert into user_content (content_id, content_text) values ('2', 'the QUICK brown fox') insert into user_content (content_id, content_text) values ('3', 'data science AND machine learning') insert into user_content (content_id, content_text) values ('4', 'TOP rated programming BOOKS') Pandas Schema: data = [[1, 'hello world of SQL'], [2, 'the QUICK brown fox'], [3, 'data science AND machine learning'], [4, 'TOP rated programming BOOKS']] user_content = pd.DataFrame({ 'content_id': pd.Series(dtype='int'), 'content_text': pd.Series(dtype='str') }) In this video, I solve LeetCode 3368 (HARD) – First Letter Capitalization step by step using SQL, focusing on Recursive CTEs. We'll break down: ✅ Understanding the problem statement and edge cases ✅ Why a Recursive CTE is the right approach here ✅ Building the recursive query from scratch (base case + recursive case) ✅ Handling character-by-character string traversal in SQL ✅ Writing clean, optimized, interview-ready SQL ✅ Common mistakes to avoid with recursive queries If you're preparing for SQL interviews, working toward a Data Analyst / Data Scientist / Data Engineer role, or just want to get better at recursive SQL logic, this walkthrough will help you build real problem-solving intuition — not just memorize a solution. 🔔 Subscribe for more LeetCode SQL solutions, data science interview prep, and step-by-step tutorials every week. 👍 If this helped you, drop a like and let me know in the comments which LeetCode SQL problem you want solved next! 📌 Problem: LeetCode 3368 – First Letter Capitalization (Hard) 📌 Concept covered: Recursive CTE (Common Table Expression) 📌 Skill level: Intermediate to Advanced SQL #DataScience #InterviewPrep #LeetCodeSQL #DataAnalyst #DataEngineer #SQLTutorial #TechInterview #CodingInterview #LearnSQL #SQLForDataScience #FAANGInterview #DatabaseQueries #EverydayDataScience #CTE #SQLPractice #100DaysOfCode #LeetCode #SQL #RecursiveCTE #SQLInterview