Back to HomeSQL
LanguageIntermediate
SQL
Interview Questions
SQL interview questions on joins, aggregations, window functions, and query optimization.
Get Real-Time SQL HelpUsed by top companies
All tech companies
Top SQL Interview Questions
Feret provides instant answers to these questions during your interview.
1
Explain different types of JOINs
Hint: INNER, LEFT, RIGHT, FULL, CROSS
Feret provides detailed answer in real-time
2
What are window functions?
Hint: ROW_NUMBER, RANK, LAG, LEAD
Feret provides detailed answer in real-time
3
How do you optimize a slow query?
Hint: EXPLAIN, indexes, query rewriting
Feret provides detailed answer in real-time
4
What is database normalization?
Hint: 1NF, 2NF, 3NF, denormalization
Feret provides detailed answer in real-time
5
Explain ACID properties
Hint: Atomicity, Consistency, Isolation, Durability
Feret provides detailed answer in real-time
6
Write a query to find duplicates
Hint: GROUP BY, HAVING COUNT > 1
Feret provides detailed answer in real-time
Related Interview Topics
Master SQL Interviews
Get invisible, real-time AI answers for SQL questions during your interview.
Get Feret Free