Joining Spark dataframes on the key

Question

I have constructed two dataframes. How can we join multiple Spark dataframes ?

For Example :

PersonDf, ProfileDf with a common col

Answer 1

inner join with scala

val joinedDataFrame = PersonDf.join(ProfileDf ,"personId")
joinedDataFrame.show

Answer 2

Posting a java based solution, incase your team only uses java. The keyword inner will ensure that matching rows only are present in the final dataframe.

            Dataset<Row> joined = PersonDf.join(ProfileDf, 
                    PersonDf.col("personId").equalTo(ProfileDf.col("personId")),
                    "inner");
            joined.show();