Databricks-Certified-Associate-Developer-for-Apache-Spark-3.0 Exam Dumps : Databricks Certified Associate Developer for Apache Spark 3.0 Exam

While only one of these code blocks works, the DataFrame API is pretty flexible when it comes to accepting columns into the pow() method. The following code blocks would also work:

transactionsDf.withColumn("predErrorSquared", pow("predError", 2))

transactionsDf.withColumn("predErrorSquared", pow("predError", lit(2)))

Static notebook | Dynamic notebook: See test 1, QUESTION NO: 26 (Databricks import instructions) ,

Explanation

Correct code block:

spark.createDataFrame([("red",), ("blue",), ("green",)], ["color"])

The createDataFrame syntax is not exactly straightforward, but luckily the documentation (linked below) provides several examples on how to use it. It also shows an example very similar to the

code block presented here which should help you answer this QUESTION NO: correctly.

More info: pyspark.sql.SparkSession.createDataFrame — PySpark 3.1.2 documentation

Static notebook | Dynamic notebook: See test 2, QUESTION NO: 23 (Databricks import instructions)

Explanation

The output is the typical output of a DataFrame.printSchema() call. The DataFrame's RDD representation does not have a printSchema or formatSchema method (find available methods in the RDD

documentation linked below). The output of print(transactionsDf.schema) is this: StructType(List(StructField(transactionId,IntegerType,true),StructField(predError,IntegerType,true),StructField

(value,IntegerType,true),StructField(storeId,IntegerType,true),StructField(productId,IntegerType,true),StructField(f,IntegerType,true))). It includes the same information as the nicely formatted original

output, but is not nicely formatted itself. Lastly, the DataFrame's schema attribute does not have a print() method.

More info:

- pyspark.RDD: pyspark.RDD — PySpark 3.1.2 documentation

- DataFrame.printSchema(): pyspark.sql.DataFrame.printSchema — PySpark 3.1.2 documentation

Static notebook | Dynamic notebook: See test 2, QUESTION NO: 52 (Databricks import instructions)