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Exam Certified Associate Developer for Apache Spark topic 1 question 92 discussion

Actual exam question from Databricks's Certified Associate Developer for Apache Spark
Question #: 92
Topic #: 1
[All Certified Associate Developer for Apache Spark Questions]

Which of the following code blocks fails to return a new DataFrame that is the result of an inner join between DataFrame storesDF and DataFrame employeesDF on column storeId and column employeeId?

  • A. storesDF.join(employeesDF, Seq(col("storeId"), col("employeeId")))
  • B. storesDF.join(employeesDF, Seq("storeId", "employeeId"))
  • C. storesDF.join(employeesDF, storesDF("storeId") === employeesDF("storeId") and storesDF("employeeId") === employeesDF("employeeId"))
  • D. storesDF.join(employeesDF, Seq("storeId", "employeeId"), "inner")
  • E. storesDF.alias("s").join(employeesDF.alias("e"), col("s.storeId") === col("e.storeId") and col("s.employeeId") === col("e.employeeId"))
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by newusername at Nov. 9, 2023, 1:31 p.m.

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Chosen Answer:
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237f4d0
8 months ago
A, because col keyword is not needed while joining
upvoted 2 times
...
tangerine141
8 months, 4 weeks ago
Selected Answer: A
Sorry A, no col
upvoted 1 times
...
tangerine141
8 months, 4 weeks ago
Selected Answer: B
storesDF.join(employeesDF, Seq("storeId", "employeeId"))
upvoted 1 times
...

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