Grouping Last Amount Paid by City and Year: SQL Solutions with Subqueries and CTEs

Computing Distance with Relation to Other Rows in High-Dimensional Space Using R

BigQuery Data-Grouping: A Step-by-Step Guide to Combining Similar Data Points

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Grouping and Summing Multiple Variables in R: A Comprehensive Guide to Data Analysis

Comparing Values of a Certain Row with a Certain Number of Previous Rows in R's data.table