The importance of SQL window functions

SQL window functions are important for several reasons.

Figure 9.1 – SQL window functions

Let’s explore some of them:

• Ease of use: Window functions simplify complex calculations by providing a convenient way to analyze a group of rows connected to the current row without requiring self-joins or multiple subqueries. This makes it easier for analysts and data scientists to perform data-wrangling tasks.
• Increased efficiency: Window functions enable you to perform calculations within a single query, reducing the need for multiple subqueries or self-joins. This results in improved query performance and reduced complexity.
• Improved readability: Window functions allow you to express complex calculations in a single query, making it easier to understand the logic and intent of the calculation. This improved readability makes it easier to maintain and modify the calculation in the future.
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