merge

A simple merge example:

a <- data.frame(
  "id"=c(1,2,3,6,7,8),
  "name"=c("Anna","Berta","Claudia","Dora","Eliane","Frida"))
b <- data.frame(
  "id"=c(1,2,3,4,5,9),
  "ort"=c("Zürich","Davos","Zermatt","Chamonix","Verbier","Sedrun"))
c.inner <- merge(a,b)
c.left <- merge(a,b, all.x=TRUE)
c.right <- merge(a,b, all.y=TRUE)
c.full <-  merge(a,b, all.x=TRUE, all.y=TRUE)