Understanding Missing Values in R: Techniques for Handling and Classifying Variables

Filtering and Counting Consecutive Records with a Given Status in SQL

Rolling Time Window with Distinct Count in Big SQL using DENSE_RANK() Function

Counting Frequencies of Values in Two Columns Using R

Mastering SQL Count then Sum Operations: A Step-by-Step Guide to Analyzing Data with Aggregate Functions

Removing Observations with Filters in R Using Dplyr Library: A Step-by-Step Guide

Counting Records by Latitude Intervals and Years in R