Question 42 of 93 · Window Functions
HelpRunning count within a group
Sort `visits` by visit_date, then add a "visit_number" column numbering each pet's visits in order (1st visit, 2nd visit, ...) using `.cum_count().over("pet_id")`.
Question 42 of 93 · Window Functions
HelpSort `visits` by visit_date, then add a "visit_number" column numbering each pet's visits in order (1st visit, 2nd visit, ...) using `.cum_count().over("pet_id")`.