Tags / unique
Replacing Unique Values in a DataFrame Column with Their Count Using Pandas: 3 Efficient Methods
Best Practices for Creating Tables with Integrity Constraints in SQL Databases
How to Select One Row from a Table Where Three Columns Have Repeating Values Using Subqueries, Window Functions, or Common Table Expressions (CTEs)
Counting Unique Elements in a Given Column After Filtering in R Using dplyr, n_distinct, Pull, and Base R