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merge several data frames in r

#put all data frames into list
df_list <- list(df1, df2, df3)

#merge all data frames in list
Reduce(function(x, y) merge(x, y, all=TRUE), df_list)
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merge two dataframes in r

#for merging coloumns
merge(a,b...) 

#for merging rows
(rbind(a,b...)
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merge dataframes with different number of rows in R

merge(data.frame(A, row.names=NULL), data.frame(B, row.names=NULL), 
  by = 0, all = TRUE)[-1]
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