SQL Joins & Window Functions Every Data Engineer Must Know | Data Engineering Live Session #3

Session 3 of the Data Engineering Roadmap is HERE — and we're going deeper into SQL! This session is laser-focused on two of the most critical and interview-tested SQL concepts: Joins and Window Functions. If you want to write production-level queries and crack data engineering interviews, this is the session you can't miss. 📌 What We Cover: 🔗 SQL JOINS — All types with real examples: ✅ INNER JOIN ✅ LEFT & RIGHT JOIN ✅ FULL OUTER JOIN ✅ SELF JOIN ✅ CROSS JOIN ✅ When to use which join (and why it matters) 🪟 WINDOW FUNCTIONS — The game-changer: ✅ RANK() vs DENSE_RANK() vs ROW_NUMBER() ✅ LEAD() & LAG() for row comparisons ✅ PARTITION BY + ORDER BY deep dive ✅ Real-world use cases with live queries