Hello guys, If you're preparing for SQL interviews or working on real-world reporting tasks, mastering window functions is no longer optional. They are one of the most powerful tools in SQL which allows you to perform calculations across rows related to the current row without collapsing your result set like GROUP BY does. Window functions like ROW_NUMBER(), RANK(), LEAD(), LAG(), and SUM() OVER help you write cleaner, faster, and more expressive queries—ideal for performance tuning and analytical processing. Let’s dive into the Top 10 SQL window function queries that you must know. --- Java, Unix, Tibco RV and FIX Protocol Tutorial