Скачать или смотреть SQL Lecture 9 | Difference Between WHERE and HAVING | Practical Examples

Welcome to Lecture 9 of our SQL Series by Debug with Nitu! 💻

In this session, we focus on one of the most powerful yet misunderstood concepts in SQL — the HAVING clause.
When GROUP BY summarises your data, HAVING helps you filter the groups based on aggregate values.

This lecture is extremely important for interviews, SQL projects, data analysis, and MIS reporting.

💡 Topics Covered in This Lecture

✅ What is HAVING Clause in SQL
✅ Difference between WHERE vs HAVING
✅ Why HAVING is used with GROUP BY
✅ Filtering data using aggregate functions (SUM, COUNT, AVG…)
✅ HAVING with single condition
✅ HAVING with multiple conditions
✅ GROUP BY + HAVING real-time examples
– Sales report
– Employee salary summary
– Student database
– Product category totals
✅ Common mistakes students make in HAVING clause
✅ Practical demonstration in phpMyAdmin

📌 By the end of this lecture, you will learn:

✔ How to filter grouped data with conditions
✔ How to apply aggregate filters like “SUM Greater than 50000”
✔ Why WHERE cannot be used for grouped data
✔ How HAVING helps in business reporting
✔ Real-world reporting examples used in companies

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