Complete PostgreSQL Course for Beginners - My Boss Hated This SQL Query – Don’t Repeat My Mistake

In this SQL tutorial, I’m sharing a personal story that completely changed how I write SQL queries. I once submitted an assignment to my boss that I thought was perfect. But he looked at my code, frowned, and said, “Why are you using NVL? This isn’t portable SQL.” He failed the entire task just because I didn’t use COALESCE. That moment made me realise the importance of cross-database compatibility. In this video, I’ll show you why COALESCE is better than NVL, how it works across databases like Oracle, MySQL, PostgreSQL, and SQL Server, and how to write clean, boss-approved SQL. If you’re serious about mastering SQL for real-world use, this tutorial is for you. 🎓 Whether you're preparing for interviews or aiming to become a pro analyst, this SQL tutorial will level up your skills. 📢 New SQL batches starting soon! Details inside the video. 🎯 Buy The MUST HAVE Book for Data Professionals here📘💡https://dataprofy.com/product-category/ebook/ ============ Watch how to configure Oracle on VS Code https://youtu.be/6mwAx4sGhwk Explore the complete PL/SQL course for FREE on my website at https://www.rebellionrider.com/category/pl-sql/ ============ The camera gear I use in my Videos https://www.amazon.in/shop/manishsharma?listId=DU9UM0XL97KM&ref=idea_share_inf ============ Connect With Me on My Social Media https://www.instagram.com/RebellionRider/ https://www.facebook.com/TheRebellionRider/ https://twitter.com/RebellionRider https://www.linkedin.com/in/mannbhardwaj/ ============ FAQ Which book to refer to learn - PL/SQL https://amzn.to/2QE1jX0 Performance Tuning https://amzn.to/2sgiAw4 1z0-071 Exam https://amzn.to/2sgfeJw Python Programming https://amzn.to/305UEbh ============ AFFILIATE DISCLOSURE: Some of the links used in the description will direct you to Amazon.in. As an Amazon Associate, I earn from qualifying purchases at no additional cost to you. #rebellionrider =============