How to Do a Left Join in R?
In this article, we will discuss how to do a left join in R programming language.
A left join is used to join the table by selecting all the records from the first dataframe and only matching records in the second dataframe.
Method 1: Using merge() function
This function is used to join the dataframes based on the x parameter that specifies left join.
- dataframe1 is the first dataframe
- dataframe2 is the second dataframe
Example: R program to perform two dataframes and perform left join on name column
Method 2: Using left_join
This performs left join on two dataframes which are available in dplyr() package.
left_join(df1, df2, by='column_name')
- df1 and df2 are the two dataframes
- column_name specifies on which column they are joined
Example: R program to find a let join