연습 문제

Reading a CSV and performing aggregations

You have a spreadsheet of Data Scientist salaries from companies ranging is size from small to large. You want to see if there is a major difference between average salaries grouped by company size.

Remember, there's already a SparkSession called spark in your workspace!

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100 XP

Load a csv file as a DataFrame and infer the schema.
Return the count of the number of rows.
Group by the column company_size and calculate the average salary with salary_in_usd.

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