How to use Window functions in SQL Server

The Ultimate Guide to SQL Window Functions

Window functions are one of the most effective shortcuts in SQL. With PARTITION BY and ORDER BY, you can group and sort rows, and with ROW_NUMBER you can instantly return the latest or highest record in each group. No complex joins or subqueries are needed. This pattern solves common problems such as finding the most recent order per customer or the top score per student in a single clean query. Many developers overlook this feature and spend far more time than necessary. If you could create a n

How to get the cumulative running total of previous rows with SQL