Counting Unique Elements in a Given Column After Filtering in R Using dplyr, n_distinct, Pull, and Base R

Assigning a Unique ID Column by Group in R: A Comparative Analysis of Base R, dplyr, and Tidyverse Packages

Creating Unique Constraints in PostgreSQL with Non-Null Values

Counting Unique Customers in Pandas DataFrame with Cumulative Totals

Replacing Unique Values in a DataFrame Column with Their Count Using Pandas: 3 Efficient Methods