# How to Do a Right Join in R (With Examples)

There are two common ways to perform a right join in R:

Method 1: Use Base R

```merge(df1, df2, by='column_to_join_on', all.y=TRUE)
```

Method 2: Use dplyr

```library(dplyr)

right_join(df1, df2, by='column_to_join_on')```

Both methods will return all rows from df2 and any rows with matching keys from df1.

It’s also worth noting that both methods will produce the same result, but the dplyr method will tend to work faster on extremely large datasets.

The following examples show how to use each of these functions in practice with the following data frames:

```#define first data frame
df1 = data.frame(team=c('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'),
points=c(18, 22, 19, 14, 14, 11, 20, 28))

df1

team points
1    A     18
2    B     22
3    C     19
4    D     14
5    E     14
6    F     11
7    G     20
8    H     28

#define second data frame
df2 = data.frame(team=c('A', 'B', 'C', 'D', 'L', 'M'),
assists=c(4, 9, 14, 13, 10, 8))

df2

team assists
1    A       4
2    B       9
3    C      14
4    D      13
5    L      10
6    M       8```

We can use the merge() function in base R to perform a right join, using the ‘team’ column as the column to join on:

```#perform right join using base R
df3 <- merge(df1, df2, by='team', all.y=TRUE)

#view result
df3

team points assists
1    A     18       4
2    B     22       9
3    C     19      14
4    D     14      13
5    L     NA      10
6    M     NA       8
```

Notice that all of the rows from df2 were included in the final data frame, but only the rows from df1 that had a matching team name were included in the final data frame.

We can use the right_join() function from the dplyr package to perform a right join, using the ‘team’ column as the column to join on:

```library(dplyr)

df3 <- right_join(df1, df2, by='team')

#view result
df3

team points assists
1    A     18       4
2    B     22       9
3    C     19      14
4    D     14      13
5    L     NA      10
6    M     NA       8```

Notice that this matches the result we obtained from using the merge() function in base R.