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Interview quiz track

First 2 free Intermediate Data & SQL

SQL Interview Questions

Practice SQL interview questions on joins and window functions. First 2 questions free with full AI feedback.

  • Level Intermediate
  • Questions 5
  • sql
  • joins
  • window-functions

Try any track free — first 2 questions include full AI feedback. Subscribe to finish the track and unlock everything. Type or speak your answer — the first 2 questions include scoring and detailed AI feedback.

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How to answer these sql interview questions

SQL interview questions check joins, aggregations, window functions, and clear reasoning. Say the approach before the syntax: what tables, what grain, how you avoid duplicates. Practice with an SQL interview quiz so you get a score and detailed feedback after each prompt. Strong answers name the pattern (anti-join, rolling average, rank) and call out edge cases like ties or nulls. Try the first 2 SQL interview questions free with full features, then subscribe to finish the track.

Sample sql interview questions

Preview 5 questions from this track in quiz order. In the full quiz you answer one at a time — type or speak — then get a score and feedback.

  1. Write a query to find the second-highest salary in an employees table.

    What a strong answer includes

    Strong answer names a clear approach — for example DENSE_RANK or ORDER BY with OFFSET — and handles ties.

  2. What is the difference between INNER JOIN and LEFT JOIN?

    What a strong answer includes

    Strong answer: INNER keeps matches only; LEFT keeps all left rows and fills nulls when the right side is missing.

  3. How do you calculate a 7-day rolling average of daily revenue?

    What a strong answer includes

    Strong answer uses a window average over the current day and the six days before it.

  4. Find customers who placed orders in 2024 but not in 2025.

    What a strong answer includes

    Strong answer uses an anti-join or EXCEPT to keep 2024 customers who do not appear in 2025.

  5. When would you use GROUP BY vs a window function?

    What a strong answer includes

    Strong answer: GROUP BY collapses rows; window functions keep row detail while adding aggregates.

SQL interview quiz FAQ

Common questions about practicing sql interview questions with a scored quiz.

What SQL interview questions should I practice?

Practice second-highest value, join vs left join, rolling averages, anti-joins (customers in one year but not another), and GROUP BY vs window functions.

Should I write full queries or explain my approach?

Do both when you can. Interviewers often care about the approach and edge cases as much as perfect syntax. A quiz helps you rehearse clear explanations under a score.

Is the SQL interview quiz free?

You can start the SQL track free. The first 2 questions include speech tools, scoring, and detailed AI feedback. Subscribe to finish the track and keep your progress.

How is this different from a mock AI interviewer?

This is a structured quiz: one question, your answer, a score and feedback. It does not open a free-form conversation with follow-up questions.