Creating Custom Aggregate Functions in PostgreSQL: A Step-by-Step Guide

Understanding Pandas GroupBy for Efficient Data Aggregation and Analysis

Calculating Percentages for Correct/Incorrect Button Presses in R: A Step-by-Step Guide to Data Analysis with R

Using Case When Statements and Windows Size for Data Grouping in R

Counting Unique Values in a Categorical Column by Group: A Deep Dive into R and Data Analysis

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

Optimizing Aggregate Functions with array_agg: A Guide to Joining Tables Effectively

Calculating Aggregate Mean in R using dplyr Package: A Tutorial

Maximizing Efficiency in Complex Queries: A Solution Using Common Table Expressions (CTEs)

Understanding POSIX Time and Its Conversion to Date-Time Format