Interview prep
SQL interview questions and query practice
Interview preparation is a major part of SQL learning. This page introduces the kinds of query problems and thinking patterns you will often see in technical interviews.
How SQL interview preparation works in practice
Strong SQL interview preparation is not just about memorizing syntax. It is about understanding joins, grouping logic, edge cases with NULLs, ranking patterns, subqueries, and how to explain trade-offs in query design and performance.
Ranking problems
Top-N queries, dense ranking, and row-level comparisons.
Grouping challenges
GROUP BY and HAVING scenarios with real business meaning.
Join edge cases
NULL handling, duplicates, and missing rows.
Advanced logic
Subqueries, CTEs, and window functions under time pressure.
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