Question: A data set is given in a file PERSONS.CSV and each record contains : 21. The database contains a list of 800 million people. Out

A data set is given in a file PERSONS.CSV and each

A data set is given in a file PERSONS.CSV and each record contains : 21. The database contains a list of 800 million people. Out of these entries, 200 million people have age 21 by ward and sort the output in descending order. a A data set is given in a file PERSONS.CSV and each record contains : 21. The database contains a list of 800 million people. Out of these entries, 200 million people have age 21 by ward and sort the output in descending order. a

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