Certified Data Engineer Associate Practice Test

Certified Data Engineer Associate Practice Test practice questions, page 5 of 12, with answer review and explanations.

Question 21

A data engineering team has two tables. The first table march_transactions is a collection of all retail transactions in the month of March. The second table april_transactions is a collection of all retail transactions in the month of April. There are no duplicate records between the tables. Which of the following commands should be run to create a new table all_transactions that contains all records from march_transactions and april_transactions without duplicate records?

  1. CREATE TABLE all_transactions AS SELECT * FROM march_transactions INNER JOIN SELECT * FROM april_transactions;
  2. CREATE TABLE all_transactions AS SELECT * FROM march_transactions UNION SELECT * FROM april_transactions;
  3. CREATE TABLE all_transactions AS SELECT * FROM march_transactions OUTER JOIN SELECT * FROM april_transactions;
  4. CREATE TABLE all_transactions AS SELECT * FROM march_transactions INTERSECT SELECT * from april_transactions;
  5. CREATE TABLE all_transactions AS SELECT * FROM march_transactions MERGE SELECT * FROM april_transactions;

Question 22

A data engineer only wants to execute the final block of a Python program if the Python variable day_of_week is equal to 1 and the Python variable review_period is True. Which of the following control flow statements should the data engineer use to begin this conditionally executed code block?

  1. if day_of_week = 1 and review_period:
  2. if day_of_week = 1 and review_period = "True":
  3. if day_of_week == 1 and review_period == "True":
  4. if day_of_week == 1 and review_period:
  5. if day_of_week = 1 & review_period: = "True":

Question 23

A data engineer is attempting to drop a Spark SQL table my_table. The data engineer wants to delete all table metadata and data. They run the following command: DROP TABLE IF EXISTS my_table - While the object no longer appears when they run SHOW TABLES, the data files still exist. Which of the following describes why the data files still exist and the metadata files were deleted?

  1. The table’s data was larger than 10 GB
  2. The table’s data was smaller than 10 GB
  3. The table was external
  4. The table did not have a location
  5. The table was managed

Question 24

A data engineer wants to create a data entity from a couple of tables. The data entity must be used by other data engineers in other sessions. It also must be saved to a physical location. Which of the following data entities should the data engineer create?

  1. Database
  2. Function
  3. View
  4. Temporary view
  5. Table

Question 25

A data engineer is maintaining a data pipeline. Upon data ingestion, the data engineer notices that the source data is starting to have a lower level of quality. The data engineer would like to automate the process of monitoring the quality level. Which of the following tools can the data engineer use to solve this problem?

  1. Unity Catalog
  2. Data Explorer
  3. Delta Lake
  4. Delta Live Tables
  5. Auto Loader