Understanding How to Handle NULL Values with PIVOT and CROSSTABs in SQL Server

Dynamic PIVOT Operations in SQL: Techniques for Handling Unknown Number of Columns

Data Pivoting in R: A Comprehensive Guide to Manipulating Data Frames

Replicating Columns in Dataframe: Summing Up Values and Keeping Rows Unique with Base R, Dplyr/Tidyr, and Purrr

Combining Data Rows from Multiple Tables Without Repeating Row IDs Using SQL Joins and Conditional Aggregation