The 40 queries that cover 90% of fresher SQL rounds: joins, GROUP BY with HAVING, subqueries, window functions, the second-highest-salary family, duplicates, dates, and the ones that look easy but trip everyone. Each query with the question, the answer, and why it works. Plus theory questions on indexes, normalisation and transactions. 24 pages.
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SQL Interview Cheat Sheet — 40 Queries
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