Test your understanding of hash maps and sets with these easy questions covering how they work, their common uses like lookups and frequency counting, and key concepts such as uniqueness and performance. Perfect for building a solid foundation in hash-based data structures.
Test your foundational knowledge of SQL joins and aggregation functions with this beginner-friendly quiz. Strengthen your SQL skills by reviewing essential concepts such as inner and outer joins, GROUP BY, and aggregate functions including COUNT, SUM, and AVG.
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