About SQL Interview Playground

A modern, interactive platform for practicing SQL skills and preparing for technical interviews.

What is this?

SQL Interview Playground is an interactive learning platform designed to help developers, data analysts, and anyone working with databases improve their SQL skills through hands-on practice.

Whether you're preparing for technical interviews, learning SQL for the first time, or sharpening your existing skills, our platform provides a comprehensive set of challenges ranging from basic SELECT statements to advanced window functions and recursive CTEs.

Key Features

✓
Real-time SQL Execution: Write and test SQL queries instantly with immediate feedback
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Progressive Difficulty: Questions organized from easy to expert level
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Interactive Code Editor: Monaco Editor with SQL syntax highlighting and autocompletion
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Table Previews: See sample data before writing your queries
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Instant Validation: Compare your results with expected outputs

Question Categories

Easy

Basic SELECT statements, WHERE clauses, simple filtering and sorting

Medium

JOINs, GROUP BY, aggregations, subqueries, and set operations

Hard

Complex JOINs, correlated subqueries, advanced filtering techniques

Expert

Window functions, recursive CTEs, advanced analytics, and optimization

How It Works

1

Choose a Question

Browse questions by difficulty level and select one that matches your skill level

2

Write Your Query

Use the interactive SQL editor to write your solution, with table previews for reference

3

Get Instant Feedback

Run your query and see if your results match the expected output

Technology Stack

Built with modern web technologies for a fast, responsive experience:

Next.js 15 with App Router
TypeScript
SQLite (in-memory execution)
Monaco Editor
Tailwind CSS
Dark/Light Mode Support
Start Practicing