To run a successful business today, having good analytics is not only beneficial but almost instrumental. SQL fluency is crucial for unlocking advanced analytics and deeper insights. Window functions are essential for this purpose, as they allow for calculations that don't group the result set, unlike aggregate functions. The basic anatomy of a window function includes an aggregate function, PARTITION BY, and ORDER BY. There are five essential windows functions for business operations: ROW_NUMBER(), SUM(), AVG(), LEAD()/LAG(), and DENSE_RANK(). These functions can be used to get first or last instance via ROW_NUMBER(), calculate cumulative sums via SUM(), compute moving averages via AVG(), compare values via LEAD() and LAG(), and rank data via DENSE_RANK(). By mastering these window functions, you can unlock advanced analytics and gain deeper insights into your business operations. `` Note: I've summarized the key points of the text in a single paragraph, focusing on the importance of SQL fluency, window functions, and their applications in business operations.