PySpark When Otherwise and SQL Case When on DataFrame with Examples
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Questions and Answers

What is the primary function of the PySpark when() function?

  • To assign a NULL value when no conditions are met
  • To create a new DataFrame column
  • To return a literal value when a condition is met (correct)
  • To filter a DataFrame based on conditions

What does the PySpark otherwise() function return by default?

  • A literal string value of 'default'
  • An empty string
  • The same value as its input
  • A NULL (None) value (correct)

Which PySpark SQL function works similarly to the 'Switch' statement in programming languages?

  • filter()
  • CASE WHEN
  • select()
  • when().otherwise() (correct)

How is the PySpark SQL Case When expression different from the if-then-else statement?

<p>Case When can use both literal and Column values in its conditions (D)</p> Signup and view all the answers

What happens when using the when() function without the otherwise() function, and no conditions are met?

<p>It returns a NULL (None) value (C)</p> Signup and view all the answers

Which PySpark function is used for chaining multiple when() clauses?

<p>chain() (D)</p> Signup and view all the answers

What is the primary function of a Case When statement in SQL?

<p>To execute a sequence of conditions and return a value when the first condition is met (B)</p> Signup and view all the answers

What is the purpose of the expr() function in PySpark SQL?

<p>To express SQL-like expressions (C)</p> Signup and view all the answers

How can you use Case When with multiple conditions in PySpark SQL?

<p>Using the AND (&amp;) or OR (|) operators (D)</p> Signup and view all the answers

What is the main difference between SQL Case When statement and PySpark SQL Case When statement?

<p>SQL Case When is used for temporary views while PySpark SQL Case When is used for DataFrames (A)</p> Signup and view all the answers

What is the purpose of the withColumn() function in PySpark SQL?

<p>To create a new column (C)</p> Signup and view all the answers

What is the result of using Case When with multiple conditions in PySpark SQL?

<p>It returns a value when at least one condition is met (C)</p> Signup and view all the answers

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