hi,
ok I understand how to use the subset function but sometimes I need to use it to extract data by date and its format it isn't so easy (like below)
for example like in using SQL I thougth that it was possible to write "%/2004" but it doesn't run. Can you help me please about this?

 subset(don, Date_O in "%/2004", select = c(Annee_O, Date_O))


      
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