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Exam Certified Associate Developer for Apache Spark topic 1 question 51 discussion

Actual exam question from Databricks's Certified Associate Developer for Apache Spark
Question #: 51
Topic #: 1
[All Certified Associate Developer for Apache Spark Questions]

The code block shown below contains an error. The code block intended to return a new DataFrame that is the result of an inner join between DataFrame storesDF and DataFrame employeesDF on column storeId. Identify the error.
Code block:
StoresDF.join(employeesDF, "inner", "storeID")

  • A. The key column storeID needs to be wrapped in the col() operation.
  • B. The key column storeID needs to be in a list like ["storeID"].
  • C. The key column storeID needs to be specified in an expression of both DataFrame columns like storesDF.storeId == employeesDF.storeId.
  • D. There is no DataFrame.join() operation – DataFrame.merge() should be used instead.
  • E. The column key is the second parameter to join() and the type of join in the third parameter to join() – the second and third arguments should be switched.
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Suggested Answer: E 🗳️
by Jtic at May 29, 2023, 3:56 a.m.

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newusername
1 year ago
Selected Answer: E
there are diff methods to join dataframes, one of the: joinedDF = StoresDF.join(employeesDF, "storeId", "inner")
upvoted 1 times
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Jtic
1 year, 6 months ago
Selected Answer: E
E storesDF.join(employeesDF, "storeID", "inner") The column key is the second parameter to join() and the type of join is in the third parameter to join() – the second and third arguments should be switched
upvoted 3 times
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