get candidate join columns in r

To get candidate join columns in R, you can use the select() function from the dplyr package to choose columns that are common between data frames that you want to join.

Here's an example:

main.r
library(dplyr)

# Create two data frames
df1 <- data.frame(id = 1:5, name = c("Alice", "Bob", "Charlie", "David", "Emily"))
df2 <- data.frame(id = 4:8, language = c("R", "Python", "Java", "C++", "PHP"))

# Select the candidate join column(s) using the select() function
join_cols <- c("id")

# Use the inner_join() function to join the data frames on the candidate join column(s)
merged_df <- inner_join(df1, df2, by = join_cols)

merged_df
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In the example above, join_cols is a vector that contains the name(s) of the column(s) that we want to use as the join key(s) between df1 and df2. We use the inner_join() function to merge the two data frames based on the join column(s), resulting in a new data frame merged_df.