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

Grouping By Day/Month/Year on a Subquery

Applying .GRP to Multiple Columns in data.table R for Separate Grouping

Creating Uneven Groups Based on Uneven Dates Using R's Custom Rolling Window Function

Grouping Numbers into Bins Based on Offset with Python

Understanding Crosstabulation Limitations: How to Apply Ranges in R for Accurate Analysis

Adding Missing Rows to Each Group with R's tidyr Package using the complete Function

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