Tags / distinct
Identifying Unique Values Across Groups: A Step-by-Step Solution in R
Counting Distinct Records in SQL Databases Using GROUP BY, HAVING, and DISTINCT
How to Select One Row from a Table Where Three Columns Have Repeating Values Using Subqueries, Window Functions, or Common Table Expressions (CTEs)
How to Retrieve Unique Data Across Multiple Columns with MySQL's ROW_NUMBER() Function