Grouping by in R as in SQL: A Deep Dive into Data Manipulation and Joining

Understanding SQL Joins and Aggregate Functions

Combining Two Count Results with Conditional Aggregation in MariaDB

Optimizing SQL Queries for Conditional Summation

How to Handle Multiple Data Types in Pandas GroupBy Operations

Understanding the Complexities of Group By Clauses: A Guide to Duplicate Values in SQL Queries

Calculating Percentage of Terminated Employees by Department in R: A Comparative Analysis of dplyr, data.table, and Base R

Transforming Data from Long Format to Wide Format Using dcast() in data.table

Solving SQL 'GROUP BY' Multiple Rows Ignoring One Using Common Table Expressions

Using max() Window Function with Case When for Conditional Grouping and Aggregation in SQL