SQL Interview Questions
Check out 30 of the most common SQL interview questions and take an AI-powered practice interview
What is SQL and when should you use it?
How do you connect to SQL?
What are the basic data types in SQL?
How do you create and manage databases in SQL?
What are tables/collections in SQL?
How do you perform CRUD operations in SQL?
What are primary keys and foreign keys in SQL?
How do you write basic queries in SQL?
What are joins/lookups in SQL?
How do you handle NULL values in SQL?
What are constraints in SQL?
How do you import/export data in SQL?
How do you optimize queries in SQL?
What is indexing in SQL?
How do you handle transactions in SQL?
What are stored procedures/functions in SQL?
How do you implement data validation in SQL?
What is normalization/denormalization in SQL?
How do you handle concurrent access in SQL?
What are triggers in SQL?
How do you implement full-text search in SQL?
What is query execution plan in SQL?
How do you handle large datasets in SQL?
What are views in SQL?
How do you monitor performance in SQL?
How do you implement sharding in SQL?
What is replication strategy in SQL?
How do you handle distributed SQL?
What are advanced optimization techniques in SQL?
How do you implement high availability in SQL?
Frequently Asked Questions
What is SQL used for?
SQL is widely used for storing, managing, and retrieving data efficiently. It's valued for its performance, reliability, and extensive ecosystem.
How long does it take to learn SQL?
Learning SQL basics typically takes 1-3 months of dedicated study. Achieving proficiency requires 6-12 months of practice and real-world projects. Mastery comes with years of experience and continuous learning.
What are the job prospects for SQL developers?
SQL developers are in high demand across industries. With strong SQL skills, you can pursue roles in database administration, data engineering, with competitive salaries ranging from ₹5-20 LPA.
What prerequisites are needed for learning SQL?
Understanding of data structures and basic SQL are helpful prerequisites for learning SQL.
Which companies use SQL?
Major companies using SQL include Google, Amazon, Microsoft, Meta, Netflix, and many more. SQL is adopted across startups to enterprise organizations.
Introduction
Preparing for database interviews with SQL expertise? Database knowledge is fundamental for any developer working with data-driven applications.
SQL is widely used for data storage, retrieval, and management. Understanding its architecture, query optimization, and best practices is essential.
This guide covers SQL interview questions ranging from basic CRUD operations to advanced topics like indexing, replication, and performance tuning.
Whether you're a backend developer or data engineer, these questions will help you demonstrate strong database expertise.
