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  1. Home
  2. Snowflake Certification
  3. COF-C02 Exam
  4. Snowflake.COF-C02.v2026-01-13.q618 Dumps
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Question 136

Which type of join will list a I rows in the specified table, even if those rows have no match in the other table?

Correct Answer: D
An outer join, specifically a left outer join, will list all rows from the left table and match them with rows from the right table. If there is no match, the result will still include the row from the left table, with NULLs for columns from the right table. References: Based on general SQL knowledge as of 2021.
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Question 137

A user is preparing to load data from an external stage
Which practice will provide the MOST efficient loading performance?

Correct Answer: A
Organizing files into logical paths can significantly improve the efficiency of data loading from an external stage. This practice helps in managing and locating files easily, which can be particularly beneficial when dealing with large datasets or complex directory structures1.
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Question 138

At what level is the MIN_DATA_RETENSION_TIME_IN_DAYS parameter set?

Correct Answer: A
TheMIN_DATA_RETENTION_TIME_IN_DAYSparameter is set at theAccountlevel in Snowflake. This parameter specifies the minimum number of days Snowflake retains the historical data for time travel, which allows users to access and query data as it existed at previous points in time.
Here's how to understand and adjust this parameter:
* Purpose of MIN_DATA_RETENTION_TIME_IN_DAYS:This parameter is crucial for managing data lifecycle and compliance requirements within Snowflake. It determines the minimum time frame for which you can perform operations like restoring deleted objects or accessing historical versions of data.
* Setting the Parameter:Only account administrators can set or modify this parameter. It is done at the account level, impacting all databases and schemas within the account. The setting can be adjusted
* based on the organization's data retention policy.
* Adjusting the Parameter:
* To view the current setting, use:
SHOWPARAMETERSLIKE'MIN_DATA_RETENTION_TIME_IN_DAYS';
* To change the setting, an account administrator can execute:
ALTERACCOUNTSETMIN_DATA_RETENTION_TIME_IN_DAYS = <number_of_days>;
Reference:For more details on data retention and time travel in Snowflake, refer to the official documentation:
https://docs.snowflake.com/en/sql-reference/account-usage/storage-usage.html#data-retention-time-travel
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Question 139

Which of the following are best practices for users with the SYSADMIN/ACCOUNTADMIN roles? Choose 3 answers

Correct Answer: A,B,C
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Question 140

When unloading data, which combination of parameters should be used to differentiate between empty strings and NULL values? (Select TWO).

Correct Answer: C,D
When unloading data in Snowflake, it is essential to differentiate between empty strings and NULL values to preserve data integrity. The parameters FIELD_OPTIONALLY_ENCLOSED_BY and EMPTY_FIELD_AS_NULL are used together to address this:
FIELD_OPTIONALLY_ENCLOSED_BY: This parameter specifies the character used to enclose fields, which can differentiate between empty strings (as enclosed fields) and NULLs.
EMPTY_FIELD_AS_NULL: By setting this parameter, Snowflake interprets empty fields as NULL values when unloading data, ensuring accurate representation of NULLs versus empty strings.
These parameters are crucial when exporting data for systems that need explicit differentiation between NULL and empty string values.
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