data1 =
data.frame
(id=
c
(1, 2, 3, 4, 5),
age=
c
(12, 23, 21, 23, 21),
marks=
c
(100, 90, 98, 87, 80))
data2 =
data.frame
(id=
c
(3, 4, 5, 6, 7),
age=
c
(12, 23, 56, 67, 48),
marks=
c
(60, 90, 91, 87, 80))
data =
merge
(data1, data2, by=
'id'
, all=
TRUE
)
print
(data)