PostgreSQL GROUP BY & HAVING Clause Explained with Practical Questions

Learn GROUP BY and HAVING Clause in PostgreSQL from beginner to advanced with practical examples and interview-focused explanations. 🚀

In this PostgreSQL tutorial, we will understand:

✅ What is GROUP BY in PostgreSQL?
✅ Why Aggregate Functions require GROUP BY
✅ COUNT(), SUM(), AVG(), MIN(), MAX() with GROUP BY
✅ Why non-aggregated columns must be included in GROUP BY
✅ Multiple Column GROUP BY Examples
✅ HAVING Clause Explained in Detail
✅ Difference Between WHERE and HAVING Clause
✅ SQL Query Execution Order
✅ Real-World Practical Queries
✅ Best Practices & Common Mistakes
✅ PostgreSQL Interview Questions

If you've already learned Aggregate Functions, this video will help you understand why PostgreSQL throws errors when selecting non-aggregated columns and how GROUP BY solves the problem.

This tutorial is perfect for:

PostgreSQL Beginners
SQL Developers
Backend Developers
Data Analysts
Database Students
Interview Preparation

------------------------------------------------------------------------------------
🔗 Useful Playlists

📘 Next.js Full Stack Playlist:
https://youtube.com/playlist?list=PLwGdqUZWnOp0lwvSBaIzzgV9X0ZiZ-42O&si=aQ_TNBNNx5L7V_bn

⚛️ React.js Playlist:
https://youtube.com/playlist?list=PLwGdqUZWnOp1Rab71vx2zMF6qpwGDB2Z1&si=sDZRxsYNetYmojKd

💻 TypeScript Playlist:
https://youtube.com/playlist?list=PLwGdqUZWnOp0xfHQFmlL52b_6-QZ0mnk_&si=c4jfsd5ElDC1p0A5
------------------------------------------------------------------------------------
💸 Get All My YouTube Videos' Source Code for just ₹199! Grab Now - https://thapatechnical.shop/source-code

📺 Watch the complete Node.JS Playlist here :https://youtube.com/playlist?list=PLwGdqUZWnOp3KELplHtc-RnJ5xTUPqdgH&si=_ob8F88HYxCdspup

🔥 Access Source Code, PPT & Notes here for Free : https://www.thapatechnical.com/2024/11/introduction-to-nodejs.html
------------------------------------------------------------------------

🚀 Boost Your Skills with these Pre-Requisite Videos:

🔗 Best HTML Course - https://youtu.be/5ccq_nLHneE
🔗 Best CSS Course - https://youtu.be/MSICFljRcb4
🔗 JavaScript Basics Course Part 1 - https://youtu.be/13gLB6hDHR8
🔗 JavaScript Advanced Course Part 2 - https://youtu.be/YwsOCN8woA8

------------------------------------------------------------------------
💸 Build Your Own E-commerce Website for Free! - https://www.thapatechnical.com/2024/03/build-complete-ecommerce-website-using.html

------------------------------------------------------------------------
✌️ Join Us!

🚀 Become a Member: Unlock perks, free source code, and more Join Now : https://www.youtube.com/channel/UCwfaAHy4zQUb2APNOGXUCCA/join
📷 Connect on Instagram: https://www.instagram.com/thapatechnical
🗨️ Join Our Discord Server: Hang out with fellow programmers Discord Link: https://discord.gg/MdScmCsua6

------------------------------------------------------------------------

⌛TIMELINE⏳