Top 45 SQL Interview Questions and Answers (2026)
The 45 SQL interview questions that actually show up in 2026 loops, with accurate answers, runnable examples, and the gotchas interviewers love.
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Patrick Wilson•
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5 articles tagged Databases - interview prep, system design, and career guidance.
The 45 SQL interview questions that actually show up in 2026 loops, with accurate answers, runnable examples, and the gotchas interviewers love.
Redis is in the stack of nearly every backend system in 2026 - cache, queue, rate limiter, leaderboard, pub/sub, session store. Interviewers expect you to know more than 'it's a key-value store.'
PostgreSQL is the default database in 2026. Backend, data, and platform interviews now lean hard on Postgres internals - MVCC, indexes, locking, replication. These 50 questions are what they actually ask.
Database interviews stopped being about SQL syntax three years ago. In 2026, interviewers want to know if you can reason about storage engines, isolation, replication, and the trade-offs between Postgres, DynamoDB, and the modern wave of distributed SQL. These 50 questions cover what's actually asked.
Forget obscure SQL trivia. These are the actual SQL questions companies ask in 2026 - from JOINs and window functions to query optimization and real-world scenarios.