Make a sum in a column in a dataframe in R

I have got a dataframe with many columns and different types for each column (text, date, integer ...) .

I want to sum one of this column and print the result.

I try different example with colsums and others but nothing ...

Can you help me ?

Thanks



Read more here: https://stackoverflow.com/questions/66280209/make-a-sum-in-a-column-in-a-dataframe-in-r

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