This is the basic version of SQL.

1. Mastering SQL Fundamentals: A
Practical Guide for Data Analysts
• By: 12367834
• Date: 2025

2. What is SQL?
• Structured Query Language
• Used to access and manipulate databases
• Popular in MySQL, PostgreSQL, Snowflake, etc.

3. Basic SQL Syntax
• SELECT column_name
• FROM table_name
• WHERE condition

4. Filtering & Sorting
• WHERE condition
• ORDER BY column
• LIMIT number

5. Aggregations
• COUNT, SUM, AVG, MIN, MAX
• GROUP BY to group rows
• HAVING to filter aggregated data

6. Joins Explained
• INNER JOIN
• LEFT JOIN
• RIGHT JOIN
• FULL OUTER JOIN

7. Subqueries vs CTEs
• Subqueries are nested
• CTEs use WITH clause
• CTEs improve readability

8. Real-World Use Case
• Use SQL to analyze customer segments
• E.g., purchases by region, age, etc.

9. Practice Exercise
• Find top 3 customers by total purchase value
• Use GROUP BY and ORDER BY

10. Summary
• SQL is essential for data analysis
• Practice regularly
• Use resources like SQLZoo, Mode