What is Power BI? A Complete Beginner’s Guide to Features, DAX & Uses (2026) If you work with data — or you want to — you’ve probably heard the name Power BI at least once. Maybe your manager mentioned it. Maybe you saw it on a job description. Or maybe you’re just curious about what all the fuss is about. Well, you’re in the right place. In this guide, we’re going to cover everything you need to know about Power BI — what it is, what it does, how to install it, how it compares to Excel, and how to write your first DAX formula. Whether you’re a complete beginner or someone who has used Excel for years, this guide is for you. Let’s get started! What is Power BI? Power BI is a business intelligence and data visualization tool developed by Microsoft. In simple words, it helps you take raw data — from Excel files, databases, websites, or apps — and turn it into beautiful, interactive reports and dashboards Instead of staring at boring rows and columns in a spreadsheet, Power BI lets y...
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| Best Websites to Practice SQL for Free in 2025 |
SQL (Structured Query Language) is one of the most important skills for anyone interested in software development, data analysis, backend development, or data science. Whether you're preparing for job interviews or learning SQL for college, practicing regularly is the key to mastering it.
The good news? You don’t need to spend money—there are many free platforms where you can learn and practice SQL hands-on. In this blog post, I’ve listed the top 10 websites to practice SQL for free in 2025, along with what makes each one special.
Let’s get started!
1. W3Schools SQL
W3Schools is one of the simplest and most beginner-friendly websites.
It offers clear explanations, examples, and a built-in editor called “Try It Yourself.”
Why it’s great
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Easy explanations for beginners
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Instant practice environment
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Covers basic to intermediate SQL concepts
Best for: Students & complete beginners
2. SQLBolt
SQLBolt is a step-by-step tutorial website designed for learners who want quick, practical lessons.
Why it’s great
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Lessons + exercises on every page
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Very clean interface
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Helps you understand concepts quickly
Best for: Fast learners who want interactive lessons
3. HackerRank – SQL
HackerRank is widely used by companies for coding assessments.
Their SQL practice section includes many real interview questions.
Why it’s great
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Beginner to advanced questions
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Company-level challenges
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Certificates available after completion
Best for: Job seekers preparing for interviews
4. LeetCode – SQL
LeetCode is the most popular coding interview platform. Their SQL questions are frequently asked in top tech companies.
Why it’s great
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Real interview SQL problems
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Problems from companies like Amazon, Google, Meta
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Huge community and discussions
Best for: Students preparing for FAANG/MAANG interviews
5. Mode Analytics SQL Tutorial
Mode Analytics offers a real-world SQL editor with sample datasets.
Why it’s great
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Practical business datasets
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Realistic SQL environment
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Great for learning data analysis + SQL
Best for: Aspiring data analysts
6. Kaggle – SQL Notebooks
Kaggle is famous for data science competitions, but they also offer free SQL lessons.
Why it’s great
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Cloud-based SQL playground
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Practice on real datasets
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Interactive notebooks
Best for: Learning data analysis + SQL together
7. GeeksforGeeks SQL
GeeksforGeeks (GFG) has one of the largest collections of SQL questions with explanations.
Why it’s great
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Theory + coding questions
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Takes you from basics to advanced
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Many interview-focused problems
Best for: Students studying for exams & interviews
8. Codecademy (Free SQL Module)
Codecademy provides a beginner-friendly interactive SQL course.
Why it’s great
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Hands-on SQL playground
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Easy lessons
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Beginner-friendly UI
Best for: Absolute beginners
9. DataCamp – SQL Basics (Free)
DataCamp offers some of its beginner SQL lessons for free.
Why it’s great
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Short, interactive video lessons
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Practice with real data
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Very friendly for beginners
Best for: Data science beginners
10. SQLiteOnline
A simple online SQL editor where you can run commands instantly.
Why it’s great
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No signup, no setup
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Fast execution
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Good for testing SQL queries quickly
Best for: Anyone who wants a quick SQL playground
How to Choose the Right Platform?
Here’s a simple guide:
| Your Goal | Best Website |
|---|---|
| Learn SQL from scratch | W3Schools, SQLBolt, Codecademy |
| Practice interview questions | HackerRank, LeetCode, GeeksforGeeks |
| Learn SQL for data analysis | Mode Analytics, Kaggle, DataCamp |
| Quick SQL testing | SQLiteOnline |
Tips to Improve Your SQL Skills Faster
To get better at SQL in 2025, follow these quick tips:
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Practice at least 2–3 queries every day.
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Use real datasets to understand practical usage.
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Solve interview-level SQL problems if you’re preparing for jobs.
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Understand concepts instead of memorizing commands.
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Revisit subqueries, joins, and group functions—they are asked most often.
conclusion
SQL will remain one of the most in-demand skills in 2025 and beyond. The platforms listed above are free, easy to use, and perfect for both beginners and advanced learners. Start practicing regularly, and you’ll be confident with SQL in no time.
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