Statistical-Programming-R/260323.R at main · ezeeera/Statistical-Programming-R · GitHub

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authors <- data.frame(
  surname = I(c("Tukey", "Venables", "Tierney", "Ripley", "McNeil")),
  nationality = c("US", "Austrailia", "US", "UK", "Australia"))

books <- data.frame(
  name = I(c("Tukey", "Venables", "Tierney", "Ripley", "McNeil")),
  year = c(1976, 1995, 1996, 1998, 2000))

authors
books
d=merge(authors, books, by.x="surname", by.y="name")
d


authors <- data.frame(
  surname = I(c("Tukey", "Venables", "Tierney", "Ripley", "McNeil")),
  nationality = c("US", "Austrailia", "US", "UK", "Australia"))

books2 <- data.frame(
  name = I(c("Tukey", "Venables", "Tierney", "Ripley", "McNeil", "Kim")),
  year = c(1976, 1995, 1996, 1998, 2000, 2008))

authors
books2
d2 = merge(authors, books2, by.x="surname", by.y="name")
d2
d3 = merge(authors, books2, by.x="surname", by.y="name", all=TRUE)
d3