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NEW QUESTION 52
You are asked to write a python function that can read data from a delta table and return the Data-Frame, which of the following is correct?

• A. Python function will result in out of memory error due to data volume
• B. Write SQL UDF to return a DataFrame
• C. Python function cannot return a DataFrame
• D. Python function can return a DataFrame
• E. Write SQL UDF that can return tabular data

Answer: A

Explanation:
Explanation
The answer is Python function can return a DataFrame
The function would something like this,
1.get_source_dataframe(tablename):
2. df = spark.read.table(tablename)
3.return df
df = get_source_dataframe('test_table')
since there is no action spark returns a Dataframe and assigns to df python variable

NEW QUESTION 53
You were asked to create or overwrite an existing delta table to store the below transaction data.

• A. 1.CREATE OR REPLACE TABLE transactions (
  2.transactionId int,
  3.transactionDate timestamp,
  4.unitsSold int)
• B. 1.CREATE OR REPLACE DELTA TABLE transactions (
  2.transactionId int,
  3.transactionDate timestamp,
  4.unitsSold int)
• C. 1.CREATE OR REPLACE TABLE IF EXISTS transactions (
  2.transactionId int,
  3.transactionDate timestamp,
  4.unitsSold int)
  5.FORMAT DELTA
• D. 1.CREATE IF EXSITS REPLACE TABLE transactions (
  2.transactionId int,
  3.transactionDate timestamp,
  4.unitsSold int)

Answer: A

Explanation:
Explanation
The answer is
1.CREATE OR REPLACE TABLE transactions (
2.transactionId int,
3.transactionDate timestamp,
4.unitsSold int)
When creating a table in Databricks by default the table is stored in DELTA format.

NEW QUESTION 54
A denote the event 'student is female' and let B denote the event 'student is French'. In a class of 100 students
suppose 60 are French, and suppose that 10 of the French students are females. Find the probability that if I
pick a French student, it will be a girl, that is, find P(A|B).

• A. 1/6
• B. 2/6
• C. 1/3
• D. 2/3

Answer: A

Explanation:
Explanation
Since 10 out of 100 students are both French and female, then
P(AandB)=10100
Also. 60 out of the 100 students are French, so
P(B)=60100
So the required probability is:
P(A|B)=P(AandB)P(B)=10/10060/100=16

NEW QUESTION 55
......