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A Beginner's Guide to Understanding SQL Window Functions and Their Capabilitiesby@yonatansali
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A Beginner's Guide to Understanding SQL Window Functions and Their Capabilities

by Yonatan Sali8mJuly 23rd, 2023
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Key Takeaways: A window function performs a calculation across a set of rows that are somehow related to the current row, Main types of functions to which window functions are applied are aggregate, ranking and value functions, To use a window function, you need to apply the over() clause that defines a window (a set of rows) within a query result set. The window function then calculates a value for each row in the window, To specify the column for which you want to perform aggregation, you need to add the partition by clause to the over() clause. Partition by is somewhat similar to grouping but returns all the rows with the aggregate function applied, instead of one row per group.
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Yonatan Sali

Yonatan Sali

@yonatansali

Head of RTB, automation enthusiast, and violinist.

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Yonatan Sali@yonatansali
Head of RTB, automation enthusiast, and violinist.

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