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

How to Use SQL Group By Limit 10: A Guide to Grouping Queries and Pagination

SQL Aggregation Techniques for Calculating Totals and Subtotals: A Comprehensive Guide

Conditional Diff Function in R: A Custom Approach for Consecutive Differences with Specific Id Numbers

Unpivoting a Query in Presto to Get Column Names Based on Condition

Efficiently Calculating Summary Statistics for Grouped Data Using R's dplyr Library

Unlocking Windowed Functions in SQL: A Practical Guide to Ranking and Filtering Data

How to Use SUM Aggregation for Specific Columns Using GROUP BY Clause

Selecting Rows with Maximal Values in a Column Using Pandas GroupBy Operations

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