Categories / group-by
Displaying Group By Results in Columns with SQL PIVOT Operator
Understanding Group By Statements in SAS and SQL for Data Manipulation and Analysis Techniques
Grouping Data by Latest Entry Using R's Dplyr Package
Grouping By Using Distinct Elements of an Array Type Column in Google BigQuery: Techniques and Best Practices for Optimization
Understanding the Complexities of Group By Clauses: A Guide to Duplicate Values in SQL Queries