Tags / distinct-values
Strict Match on Many-to-One Relationships in Lookup Tables Using SQL
Efficient Counting of Distinct Values Across Columns of a DataFrame, Grouped by Rows in Python Using pandas Library
Counting Unique IDs Within a Moving Time Window in Oracle SQL Using MATCH_RECOGNIZE
Counting Distinct IDs for Each Day within the Last 7 Days using SQL
Counting Unique Values That Appear More Than X Times in R