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QuestionTranscript

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Strong SQL fundamentals with room for optimization

Score: 92/100

Score Breakdown

Right DataFormattingLogicExplanationSpeed

Summary

Strong solution using appropriate JOIN operations and aggregation functions.

Answer

SELECT d.name AS Department, e.name AS Employee, e.salary AS Salary
FROM Employee e
JOIN Department d ON e.departmentId = d.id
WHERE (e.departmentId, e.salary) IN (
  SELECT departmentId, MAX(salary)
  FROM Employee
  GROUP BY departmentId
);

Final Thoughts

  • Excellent understanding of basic SQL operations
  • Could improve on advanced optimization techniques
  • Strong foundation for most SQL interview questions
Interviewer

For this interview question, I'd like you to write a SQL query to find the highest-paid employee in each department.

You

I'll need to use JOIN to connect the Employee and Department tables, then find the max salary per department.

Interviewer

That's right. You need to join the tables and find maximum salaries grouped by department.

You

I can use a subquery to find the max salary per department, then join with the original tables to get the employee names.

Interviewer

That's a good approach. Can you write the query?

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Amy responds naturally, acknowledges answers, and keeps the flow human

Interviewer

Hi Josh, I see you built a web application with React and Node.js on your resume. Can you walk me through what the project was about and what role you played?

You

It was an e-commerce site. I worked on the frontend mostly.

Interviewer

That sounds interesting. What part of the frontend did you focus on and what was the biggest challenge you faced?

You

I built the product listing page. The challenge was performance when there were lots of items.

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QuestionTranscript
Interviewer

Hello! Let's look at a standard financial analysis problem. Given an array of stock prices over time, how would you maximize profit with just one buy and one sell?

You

I initially thought about comparing every pair of days using nested loops, but that would be O(N^2).

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59
Total Interviews
15h 36m
Total Time
71.2
Avg Performance
14.6%
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Problem SolvingAlgorithm KnowledgeCode QualityTime ComplexityTest Cases

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01/01/2402/01/2403/01/2404/01/2405/01/2406/01/2407/01/240255075100

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015304560TechCorpDataSystemsCloudSoft

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