Window functions in Database

Date: 2024-09-26

This article explains PostgreSQL window functions, which perform calculations across related table rows without collapsing them like aggregate functions. It details common window functions including ROW_NUMBER(), RANK(), DENSE_RANK(), SUM(), AVG(), LEAD(), and LAG(), illustrating their usage with SQL queries on a sample sales table. These functions enable ranking, cumulative calculations, and comparisons between adjacent rows, providing more sophisticated data analysis capabilities. The article also briefly covers setting up PostgreSQL using Docker.

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