Returning NULL Values in Aggregate Columns with Complex WHERE Clauses

Improving Patient Outcomes with R: A Comprehensive Guide to Case_When Function with Complex Conditions

Creating a Column Based on Substring of Another Column Using `case_when` with Alternative Approaches

Transforming Table Structure: SQL Query for Aggregating Data

Understanding Case Statements in SQL Queries: A Deep Dive into the `COALESCE` Function

Understanding the Power of Conditional Logic: Mastering SQL Server's CASE Statement with Multiple Tables