Complete PostgreSQL Course for Beginners - Can You Fix Your SQL Query in JUST 5 Minutes with Window Functions?

Learn how SQL window functions like lead and lag can save you time and help you optimise your queries. Watch as we fix a SQL query in just 5 minutes using these powerful functions! How SQL window function saved me from writing an ugly self-join. In this SQL tutorial, I’ll show you how I replaced a complicated self-join with a more innovative, cleaner approach using LAG() and LEAD() window functions. This trick not only made my SQL query easier to understand but also significantly optimized its performance. This video is a must-watch if you're tired of messy joins and slow queries. Book Buying Link --- Mastering SQL Windows Functions https://dataprofy.com/product-category/ebook/ 📘 Want to go deeper into window functions? Grab a copy of my book “Mastering SQL Window Functions” with practical examples and real interview-level tricks. 👉 Comment SQL below and I’ll DM you the link! 🔔 Subscribe and follow for honest, real-world SQL tutorials.