R merge by two columns

R merge columns

#Merging first_name and last_name columns to create full_name. 
union(table_name, full_name, first_name, last_name, sep = " ")
#sep is the delimiter to merge by, in this case a space.

R how to merge data frames

merge(x = df1, y = df2, by = c("Name_tag1", "Name_tag2"), all = TRUE)

Source: stackoverflow.com

R merge by two columns

x <- data.frame(k1=c(NA,NA,3,4,5), k2=c(1,NA,NA,4,5), data=1:5)
y <- data.frame(k1=c(NA,2,NA,4,5), k2=c(NA,NA,3,4,5), data=1:5)
merge(x, y, by=c("k1","k2"))

Source: stackoverflow.com

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