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I am good with SQL and I naturaly use sqldf package.
However, it is useful to know native R way to achieve various SQL commands.
on a dataframe column, how can I achieve a similar count as in the last command?
library(ggplot2)
head(tips,3)
sqldf("select count(distinct day) from tips")
ok. I got little better now and can answer my own question.
and then count how long is that list dim(d)