SQL Interview Questions From Basics to Advanced

Written in clear, beginner-to-advanced progression, it starts with rock-solid fundamentals and rapidly escalates to the trickiest concepts interviewers love to test: complex joins, correlated subqueries, window functions, recursive CTEs, pivoting data, handling NULLs and duplicates, query optimization, indexes, stored procedures, triggers, and transaction management.
Each topic includes:
Explains the concept simply and deeply
Shows common pitfalls and how to avoid them
Provides multiple solutions (subquery vs join vs window function)
Includes real interview questions with detailed model answers
Teaches you how to think and explain aloud like a top-tier candidate
Practice with over 50 carefully curated questions (from fresher to architect level), all based on a consistent sample schema you can build and test instantly. Follow the proven 12-week study roadmap that has helped thousands move from "I hope I pass" to "I crushed that interview."
Learn exactly how to:* Spot and handle edge cases (NULLs, ties, empty tables)* Write clean, performant queries under pressure* Explain your thought process clearly and confidently* Optimize when the interviewer asks "how would this scale to millions of rows?"* Turn red flags (slow queries, wrong join types) into green flags
Perfect for self-study or last-minute interview prep. Includes mock interview scripts, verbal explanation templates, project ideas for your resume, and the exact phrases top candidates use to impress interviewers.
Stop memorizing - start mastering. Get the unfair advantage in your next SQL interview.

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