Databricks Certified Associate Developer For Apache Spark 30 · Free Practice Question Easy
Question 6
Which of the following code blocks merges two DataFrames df1 and df2 ?
-
A
df1.appendAll(df2) -
B
df1.append(df2) -
C
df1.add(df2) -
D
df1.addAll(df2) -
E
df1.merge(df2) -
F
df1.union(df2)
Reveal correct answer
Correct answer: F
Explanation
DataFrames are immutable. This means users cannot append to DataFrames because that would be changing it. To append to a DataFrame, you must union the original DataFrame along with the new DataFrame.Discussion
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