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Snowflake Certified SnowPro Specialty - Snowpark Sample Questions (Q366-Q371):

NEW QUESTION # 366
You have a Snowflake table named 'raw events' with a VARIANT column named 'event data'. The 'event data' column contains JSON objects with a field 'timestamp' that is sometimes represented as a string and sometimes as a number (Unix epoch). You need to create a Snowpark DataFrame that extracts the 'timestamp' as a timestamp object, handling both string and numeric representations. Which of the following code snippets correctly accomplishes this, avoiding errors when encountering incompatible types?

Answer: A

Explanation:
Option D correctly uses the 'is_number' function to check if the timestamp is numeric. If it is, it divides by 1000 (assuming milliseconds) and converts to a timestamp. If it's not numeric, it converts directly to a timestamp (assuming it is a string representation). Options A, B, C, and E will fail when encountering mixed data types because 'to_timestamp' expects either a number or a string, not both interchangeably. Casting numeric value as String then passing to 'to_timestamp' would raise issues, it needs to be divided.

NEW QUESTION # 367
You are working with a Snowpark DataFrame containing customer data, including a 'phone_number' column. Some phone numbers are missing or have incorrect formats. You want to impute missing values with a default phone number '000-000-0000' and remove any phone numbers that do not match the pattern 'XXX-XXX-XXXX' using Snowpark Python. Which of the following code snippets achieves this most efficiently?

Answer: A

Explanation:
Option E is correct. It uses 'when' with 'isnull' to impute missing phone numbers and 'regexp_like' to filter out invalid formats. Options A and B are similar but less explicit. Option C omits 'lit', which makes the code incorrect as it won't work with Snowpark. Option D does not use 'lit' and also 'fillna' will give an exception if datatypes doesnt match

NEW QUESTION # 368
You have a Snowpark DataFrame called 'employee_data' with columns 'employee_id', 'department' , 'salary' , and 'hire date'. You need to perform the following transformations: 1. Calculate the average salary for each department. 2. For each employee, determine their salary relative to the average salary of their department (salary - average department salary). 3. Filter out employees whose salary is below the average salary for their department. 4. Display the 'employee_id', 'department' , 'salary' , and the salary difference from the average department salary. Which of the following represents a correct and efficient Snowpark implementation?

Answer: A

Explanation:
Option E is the correct and most efficient solution. It correctly calculates the average salary per department, joins this information back to the original DataFrame, calculates the salary difference, filters the data, and selects the required columns. Using 'cor objects to refer to column names consistently improves readability and robustness. Correct use of from snowflake.snowpark.functions import avg, col. Avoid using 'collect()' to bring data to the client side. The join condition should consistently use 'col()' notation. Correct usage of employee_data[col('department')l and avg_salaries[col('avg_salary')l to specify the columns used for the calculation in the withColumn function.

NEW QUESTION # 369
You have a Snowflake view named 'SALES SUMMARY VW' that joins several large tables and performs complex aggregations. You need to create a Snowpark DataFrame from this view Which of the following considerations are MOST important to ensure optimal performance and resource utilization when working with this DataFrame?

A. Materialize the view into a temporary table using 'CREATE TEMPORARY TABLE AS SELECT FROM SALES SUMMARY VW before creating the Snowpark DataFrame.
B. Always specify the schema explicitly when creating the DataFrame from the view to prevent Snowpark from inferring it.
C. Leverage Snowpark's lazy evaluation and pushdown optimization capabilities by performing transformations and filtering on the DataFrame before executing actions.
D. Avoid calling 'collect()' or 'toPandas()' on the entire DataFrame unless absolutely necessary, as these operations bring all data into the client's memory.
E. Use 'session.sql()' with the view's definition to create the DataFrame, as this is generally faster than 'session.table()' for views.

Answer: C,D

Explanation:
Options A and C are crucial. Option A highlights the danger of bringing large datasets into the client environment. Option C emphasizes the importance of Snowpark's core principles for efficiency. Option B is incorrect; Snowpark can efficiently infer the schema. Option D is generally less optimal than using 'session.table()' directly for views because 'session.table()' provides more opportunities for optimization by Snowpark. Option E materializes the view which would consume storage and may not be ideal unless intermediate results needs to be re-used multiple times. Furthermore temporary tables are only viable in current session context

NEW QUESTION # 370
You have configured your Snowpark application to use a '.env' file for storing connection parameters. The ' .env' file contains the following:

Which of the following code snippets demonstrates the most secure and recommended method for creating a Snowpark session using these environment variables and also ensuring the file exists?

Answer: D

Explanation:
Option D is the most robust because it explicitly checks for the existence of the .env' file using 'pathlib' before attempting to load it, raising a FileNotFoundError' if it's missing, AND it utilizes 'os.environ.get()' which is safer than directly accessing 'os.environ[]" because it returns if the environment variable doesn't exist, preventing 'KeyError' exceptions, although in this case the .env' file not being present is detected. Options A, B, C and E don't proactively check for file existence prior to opening, and could thus potentially fail or crash the Snowpark session, or could inadvertently utilize invalid default values, which could lead to unexpected or incorrect behavior. Providing default values (Option E) might mask configuration errors.

NEW QUESTION # 371
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Glen Stark Glen Stark

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