Top 100 SQL Interview Questions& Answers for 2025
Ace your data analyst interviews with our comprehensive guide covering basic to advanced SQL concepts. Includes JOIN operations, subqueries, window functions, and performance optimization.
What's Covered in the Guide
Basic SQL
25 Questions
JOIN Operations
20 Questions
Advanced Queries
30 Questions
Window Functions
15 Questions
Top 10 Most Asked SQL Interview Questions
These questions appear in 80% of data analyst interviews
What is the difference between INNER JOIN and OUTER JOIN?
How do you find duplicate records in a table?
Explain the difference between WHERE and HAVING clause
What are Window Functions and how to use them?
How to find the Nth highest salary in SQL?
What is the difference between UNION and UNION ALL?
Explain normalization and its types
What are indexes and how do they improve performance?
How to optimize slow SQL queries?
What is a subquery and when to use it?
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Refresh SELECT, WHERE, GROUP BY and build confidence with easy wins.
Week 2
Query Mastery
Crack subqueries, correlated queries and complex filtering tasks.
Week 3
Optimization & Joins
Master performance tuning, indexes and advanced JOIN patterns.
Week 4
Mock Interviews
Simulate real interviews with whiteboard questions and feedback.
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