[R] match in dependence of 2 columns

[Mat]

thank you, this code works:

library(plyr)
join(dat1,dat2,by=c("cu.nr.","name"),type="right") 

but my dat2 frame has a lot of columns, which i don't want to match.
How can i say, that only the column "value" should be match to dat1 ?

Thank you.

Mat




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