SQL GROUP BY, HAVING & SUBQUERY Tutorial (For Beginners)
Автор: Data Guru
Загружено: 2026-01-03
Просмотров: 69
Learn SQL GROUP BY, HAVING, and SUB QUERY in the simplest way!
This beginner-friendly tutorial explains how to group data, filter groups, and use subqueries in real-time SQL examples.
🔥 Topics Covered:
✔️ What is GROUP BY in SQL?
✔️ GROUP BY with multiple columns
✔️ HAVING vs WHERE difference
✔️ Aggregation functions: COUNT, SUM, AVG, MAX, MIN
✔️ What is a Subquery?
✔️ Subquery inside WHERE
✔️ Subquery inside SELECT
✔️ Practical examples for beginners
🧠 By the end of this video, you will learn:
– How to summarize your data
– How to filter grouped results
– How subqueries help fetch data from another query
– How to write clean and optimized SQL queries
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