SQ
SQL Interview Practice
Joins, indexing, query optimization, window functions, and database design.
Start Practice
SQLBeginnerIntermediateAdvancedExpert30 min
Choose mode, difficulty & questions on the next screen
Topics Covered
JoinsIndexingQuery OptimizationWindow FunctionsCTEsTransactionsNormalizationStored Procedures
Difficulty Levels
Beginner
Fundamentals and core concepts. Great for getting started or refreshing basics.
Intermediate
Practical application, common patterns, and real-world problem solving.
Advanced
Deep internals, performance optimization, and architectural decisions.
Expert
Staff+ level. Edge cases, trade-off analysis, and system-level thinking.
Question Types
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Coding
Write code, implement functions, solve problems
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Conceptual
Explain concepts, compare approaches, discuss trade-offs
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System Design
Architect systems, design APIs, plan infrastructure
