Databricks Certified Associate Developer for Apache Spark — Question 109

Which of the following DataFrame operations is classified as a transformation?

Answer options

• A. DataFrame.select()
• B. DataFrame.count()
• C. DataFrame.show()
• D. DataFrame.first()
• E. DataFrame.collect()

Correct answer: A

Explanation

The correct answer is A, as DataFrame.select() creates a new DataFrame based on the specified columns, which is a transformation operation. The other options such as DataFrame.count(), DataFrame.show(), DataFrame.first(), and DataFrame.collect() are actions that return values or display data, rather than transforming the DataFrame itself.