Understanding Joins and Handling Duplicate Rows in SQL Queries: Strategies for Minimizing Duplicates

Understanding Left Outer Joins: How to Fix a Join That Isn't Returning Expected Results

SQL Join Against Date Ranges: Exploring Consecutive Dates with LAG, DATEDIFF, and Grouping

Using ifelse for a List Inside a Dataframe: A Step-by-Step Guide to Efficient Key Extraction and Best Practices

Using Aggregate Functions and Joining Tables to Find Matching Department Hires