SQL Window Functions Don't Have to Be Scary 🪟

This article provides a clear explanation of five essential window functions in SQL: ROW_NUMBER(), RANK(), DENSE_RANK(), LAG(), and LEAD(). It outlines how each function handles ties and gaps, and suggests appropriate use cases for them. The structure of all window functions is explained as function() OVER (PARTITION BY ... ORDER BY ...). Additionally, the article mentions exploring other functions like SUM(), AVG(), COUNT() as window functions, NTILE() for bucketing rows, and frame clauses for rolling calculations once comfortable with these basics.

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