Categories / group-by
Using n_distinct to Extract Unique Values by Specific Conditions in R Data Analysis
Using Arrays for Conditional Aggregation in BigQuery: A Pivot Table Solution
Extracting Specific Values from Grouped Data with Pandas: A Comprehensive Guide
How to Handle Multiple Data Types in Pandas GroupBy Operations
Using GROUP_CONCAT to Aggregate Text Results in MySQL Databases: Best Practices and Troubleshooting Strategies
Transforming Data from Long Format to Wide Format Using dcast() in data.table