[빅분기 실기] T1-29. 12월인 데이터 수는?

https://www.kaggle.com/code/yimstar9/t1-29-datetime-format # your code df<-read.csv("/kaggle/input/bigdatacertificationkr/payment.csv") library(dplyr) library(lubridate) ans<-df%>%mutate(pre_date=ymd(date))%>%filter(month(pre_date)==12) cat(nrow(ans))...