Handling Missing Dates in R: A Deep Dive into Date Range Calculation after Every Seventh Day While Ignoring the Missing Dates

Calculating Cumulative Sums with Window Functions in SQL: A Guide to Choosing Between GROUP BY and Window Functions

Understanding Data Manipulation in R: Collapse and Sum Columns Names

Sum a Column Based on Condition in R Using Filter and Summarise Functions

Summing Multiple Columns with Variable Names Using String Manipulation in R