Using Melt to Loop Over a Vector in Data.table: Filtering and Summarizing with by

Mastering Group by Operations with Summarise in R with dplyr: A Comprehensive Guide to Data Aggregation

Mastering Group by and Conditional Count in R's dplyr Library: A Deep Dive

Range Grouping with dplyr: A Deeper Dive into Range Grouping Techniques for Efficient Data Analysis

Grouping Dataframe by Similar Non-Matching Values: A Step-by-Step Solution

Optimizing Queries to Retrieve Rows with Maximum Date Only When Duplicate: A Deep Dive into SQL Query Optimization Strategies

Finding Equal Row Sets Across Different Tables in SQL Server Using the FOR XML Trick or Alternative Approaches