SQL Interview Questions
SQL interview questions covering joins, window functions, and reasoning about the query plan rather than just the result.
Sample scorecard
Sql screen
What the report tells you to close:
The short version
Why the Sql interview is hard
SQL interviews start with joins and aggregation, then separate candidates on window functions and on whether you can reason about how the query executes rather than only whether it returns the right rows.
What to expect
The rounds you should rehearse
Window functions
ranking, running totals and per-group comparisons without self-joins.
Join semantics
what happens to nulls and duplicates, which is where results quietly go wrong.
Query plans and indexes
why this query is slow, and what index would change that.
Avoid these
The mistakes that quietly sink candidates
Writing a correct query with no sense of what it costs to run.
Overlooking nulls and duplicates, the two most common sources of a wrong-but-plausible answer.
Reaching for a subquery where a window function is clearer and faster.
Reading the questions is not practicing them.
Run a live voice mock tuned to the Sql interview. It follows your answers, probes the gaps, and scores you like a senior interviewer would.
FAQ
Questions, answered.
What SQL level do interviews expect?▾
Do I need to understand indexes?▾
Walk in knowing exactly what they will ask.
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