✅ Free Resources to Learn SQL in 2025 🧠📚

1. YouTube Channels
• freeCodeCamp – Comprehensive SQL courses
• Simplilearn – SQL basics and advanced topics
• CodeWithMosh – SQL tutorial for beginners
• Alex The Analyst – Practical SQL for data analysis

2. Websites
• W3Schools SQL Tutorial – Easy-to-understand basics
• SQLZoo – Interactive SQL tutorials with exercises
• GeeksforGeeks SQL – Concepts, interview questions, and examples
• LearnSQL – Free courses and interactive editor

3. Practice Platforms
• LeetCode (SQL section) – Interview-style SQL problems
• HackerRank (SQL section) – Challenges and practice problems
• StrataScratch – Real-world SQL questions from companies
• SQL Fiddle – Online SQL sandbox for testing queries

4. Free Courses
• Khan Academy: Intro to SQL – Basic database concepts and SQL
• Codecademy: Learn SQL (Basic) – Interactive lessons
• Great Learning: SQL for Beginners – Free certification course
• Udemy (search for free courses) – Many introductory SQL courses often available for free

5. Books for Starters
• “SQL in 10 Minutes, Sams Teach Yourself” – Ben Forta
• “SQL Practice Problems: 57 Problems to Test Your SQL Skills” – Sylvia Moestl Wasserman
• “Learning SQL” – Alan Beaulieu

6. Must-Know Concepts
• SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY
• JOINs (INNER, LEFT, RIGHT, FULL)
• Subqueries, CTEs (Common Table Expressions)
• Window Functions (RANK, ROW_NUMBER, LEAD, LAG)
• Basic DDL (CREATE TABLE) and DML (INSERT, UPDATE, DELETE)

💡 Practice consistently with real-world scenarios.

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1. Day 1: Introduction to SQL, its importance, and various database systems.
2. Day 2: Installing a SQL database (e.g., MySQL, PostgreSQL).
3. Day 3: Setting up a sample database and practicing basic commands.

Day 4-7: Basic SQL Queries
4. Day 4: SELECT statement, retrieving data from a single table.
5. Day 5: WHERE clause and filtering data.
6. Day 6: Sorting data with ORDER BY.
7. Day 7: Aggregating data with GROUP BY and using aggregate functions (COUNT, SUM, AVG).

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Day 8-14: Working with Multiple Tables
8. Day 8: Introduction to JOIN operations.
9. Day 9: INNER JOIN and LEFT JOIN.
10. Day 10: RIGHT JOIN and FULL JOIN.
11. Day 11: Subqueries and correlated subqueries.
12. Day 12: Creating and modifying tables with CREATE, ALTER, and DROP.
13. Day 13: INSERT, UPDATE, and DELETE statements.
14. Day 14: Understanding indexes and optimizing queries.

Day 15-21: Data Manipulation
15. Day 15: CASE statements for conditional logic.
16. Day 16: Using UNION and UNION ALL.
17. Day 17: Data type conversions (CAST and CONVERT).
18. Day 18: Working with date and time functions.
19. Day 19: String manipulation functions.
20. Day 20: Error handling with TRY...CATCH.
21. Day 21: Practice complex queries and data manipulation tasks.

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Day 22-28: Advanced Topics
22. Day 22: Working with Views.
23. Day 23: Stored Procedures and Functions.
24. Day 24: Triggers and transactions.
25. Day 25: Windows Function

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26. Day 26: SQL Project-1
27. Day 27: SQL Project-2
28. Day 28: SQL Project-3
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