How do you use the merge function in R language?

In the R programming language, the merge function is used to combine two data frames. The general usage of this function is as follows:

merged_df <- merge(df1, df2, by = "key")

df1 and df2 are two data frames to be merged, with ‘by’ indicating the key to merging the frames, or the variable name used to connect the two data frames. By default, the merge function will combine the two data frames based on the same key values.

In addition to the “by” parameter, the merge function also has other parameters that can be used to control the way merging is done, such as “all.x”, “all.y”, and “all”. For specific usage, refer to the help documentation or official documentation of the R language.