Web Reference: Jan 17, 2026 · SQL window functions are mainly of two types: aggregate window functions and ranking window functions. Example: First, we create a demo table Employee, and now we will apply window functions on it. Aggregate window functions calculate aggregates over a window of rows while retaining individual rows. Common aggregate functions include: Window functions can be called in the SELECTstatement or in the ORDER BYclause. However, they can never be called in the WHEREclause. You’ll notice that all the examples in this article call the window function in the SELECT column list. Let’s go to the first SQL window function example. We will use the “Employee” table: We will begin with RANK, wh... This tutorial shows you how to use the SQL window functions to solve complex query challenges in easy ways.
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