Databricks Data Engineer Associate Question 159
Select 3You are working on a Databricks notebook and need to extract the year, month, and day from a timestamp column named event_timestamp in a DataFrame. Which of the following methods can you use to achieve this?
- A
Use the
year,month, anddayofmonthfunctions from thepyspark.sql.functionsmodule. - B
Use the
extractfunction from thepyspark.sql.functionsmodule. - C
Use the
date_formatfunction with appropriate patterns like 'yyyy', 'MM', and 'dd'. - D
Use the
to_datefunction and then extract the year, month, and day. - E
Use SQL expressions with functions like
YEAR,MONTH, andDAYin a Spark SQL query.
Show answer and explanation
Correct answers: A, C, E
Explanation
Extracting calendar data from a timestamp in Databricks can be done using multiple approaches. The year, month, and dayofmonth functions are built into PySpark for this purpose. Alternatively, the date_format function allows flexible formatting to extract specific components as strings. Additionally, Spark SQL provides functions like YEAR, MONTH, and DAY that can be used in SQL queries. The extract function is not available in PySpark, and while to_date converts a timestamp to a date, it does not directly extract year, month, or day.
- A. Correct.
Correct. The
year,month, anddayofmonthfunctions in thepyspark.sql.functionsmodule are specifically designed to extract the respective components from a timestamp. - B. Incorrect.
Incorrect. The
extractfunction is not available in PySpark for extracting calendar data from a timestamp. - C. Correct.
Correct. The
date_formatfunction can format a timestamp into a string representation of specific components like year ('yyyy'), month ('MM'), and day ('dd'). - D. Incorrect.
Incorrect. While
to_dateconverts a timestamp to a date, it does not directly extract year, month, or day. Further transformations would be required. - E. Correct.
Correct. Spark SQL supports the
YEAR,MONTH, andDAYfunctions, which can be used in a SQL query to extract calendar components from a timestamp.