Pyspark - Rank vs. Dense Rank vs. Row Number

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Learn to use Rank, Dense rank and Row number in Pyspark in most easy way. Also, each of them have their own use cases, so, learning the difference between the three will be very beneficial.

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I am new to pyspark and learning more...I took one supermarket sales dataset and was trying to solve this question : "Find for each Product line which Country has the highest Gross income?" Here Product line, country and gross income are separate columns in a pyspark dataframe. Would appreciate if you can help me with this. Thanks in advance :)

nishikumari