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並前往https://stackoverflow.com/questions/38062848/vlookup-with-data-table-in-r

Vlookup with data.table in R - Stack Overflow

DF1<-merge(DF1, lookup[,.(id, name)], by='id', all.x=TRUE, all.y=FALSE). I think the merge command is what you are looking for here, but you were missing ...

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