SQL Interview Questions — a practical guide to SQL interview questions with clear examples you can reuse in real projects.
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Short description
Be ready for joins, indexes, normalization, transactions, and NULL behavior.
Sample Q&A
Q: WHERE vs HAVING?
A: WHERE filters rows; HAVING filters groups.
Q: LEFT vs INNER JOIN?
A: LEFT keeps all left rows; INNER only matches.
Q: Why indexes?
A: Faster lookups/joins; trade-off on writes.