
SQL Window Functions: A Quick Review With Examples | HackerNoon
Introduction Window functions are a powerful feature in SQL used to perform calculations across a set of rows related to the current row. Unlike aggregate functions, window functions do not group rows into a single output; they return a result for each row while maintaining the context of the dataset. In this article, we’ll explore some commonly used SQL window functions (ROW_NUMBER(), RANK(), DENSE_RANK(), NTILE(), LEAD(), and LAG()) with examples. Sample Table: Sales Data We’ll