Welcome to the SQL Learning and Practice Guide!
This repository is designed to provide a comprehensive foundation for anyone starting with SQL, including essential commands, advanced queries, and hands-on exercises for real-world data analysis. Whether you’re a beginner or looking to refine your SQL skills, this guide will help you progress step by step.
- Basics: Foundational SQL commands like SELECT, WHERE, JOIN, etc.
- Intermediate SQL: Covers concepts like GROUP BY, HAVING, CASE, and nested queries.
- Advanced SQL: Includes complex joins, subqueries, CTEs (Common Table Expressions), and window functions.
- Practice Datasets: Sample datasets to practice SQL queries and run exercises.
- Projects: End-to-end projects combining multiple SQL concepts for data analysis and reporting.
- SQL Basics
- Selecting Data: SELECT, FROM, WHERE, DISTINCT
- Sorting and Filtering: ORDER BY, LIMIT, LIKE
- Basic Aggregations: COUNT, SUM, AVG, MIN, MAX
- Intermediate SQL
- Grouping Data: GROUP BY and HAVING
- Joining Tables: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN
- Subqueries: Nested queries for more complex filtering
- Conditional Expressions: CASE WHEN statements for custom conditional logic
- Advanced SQL
- Common Table Expressions (CTEs): Temporary result sets to simplify complex queries
- Window Functions: ROW_NUMBER, RANK, PARTITION BY for advanced data analysis
- Advanced Aggregations: Grouped aggregations with complex conditions
- Performance Optimization: Indexing, execution plans, and optimization tips
- SQL Reference: W3Schools SQL Tutorial
- Advanced SQL Tutorials: Mode Analytics SQL Guide
- Sample Databases: Check /datasets folder for databases to load and practice.