How to join multiple data frames using dplyr?

Question

I want to left_join multiple data frames:

dfs <- list(
  df1 = data.frame(a = 1:3, b = c(\"a\", \"b\", \"c\")),
  df2 = data.frame(c = 4:6, b         


        

Answer 1

It's been too late i know....today I got introduced to the unanswered questions section. Sorry to bother.

Using left_join()

dfs <- list(
              df1 = data.frame(b = c("a", "b", "c"), a = 1:3),
              df2 = data.frame(d = c("a", "c", "d"), c = 4:6),
              df3 = data.frame(b = c("b", "c", "e"), d = 7:9)
         )

func <- function(...){
  df1 = list(...)[[1]]
  df2 = list(...)[[2]]
  col1 = colnames(df1)[1]
  col2 = colnames(df2)[1]
  xxx = left_join(..., by = setNames(col2,col1))
  return(xxx)
}
Reduce( func, dfs)
#  b a  c  d
#1 a 1  4 NA
#2 b 2 NA  7
#3 c 3  5  8

Using merge() :

func <- function(...){
  df1 = list(...)[[1]]
  df2 = list(...)[[2]]
  col1 = colnames(df1)[1]
  col2 = colnames(df2)[1]
  xxx=merge(..., by.x = col1, by.y = col2, , all.x = T)
  return(xxx)
}

Reduce( func, dfs)
#  b a  c  d
#1 a 1  4 NA
#2 b 2 NA  7
#3 c 3  5  8

Answer 2

Would this work for you?

jnd.tbl <- df1 %>%
    left_join(df2, by='b') %>%
    left_join(df3, by='d')