Advanced Data Manipulation with R: Selecting Columns Based on Patterns in a data.table Using Regular Expressions

Selecting Columns with a Range of Values in R: A Comparative Approach Using dplyr, tidyr, and Other Methods

Understanding Hexadecimal Representation in SQL

Solving the SQL Join Puzzle: 3 Approaches for Two Queries Returning No Results

Count Rows from a Single Table Based on Multiple Conditions Using SQL: A Step-by-Step Guide to Efficient Solutions