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Exam NAS-C01 Topic 1 Question 109 Discussion

Actual exam question for Snowflake's NAS-C01 exam
Question #: 109
Topic #: 1
You're developing a Snowflake Native Application that stores user preferences in a table named 'USER PREFERENCES'. In version 1.0, this table only contained 'USER ID and 'THEME' columns. In version 2.0, you need to add a new 'LOCALE' column with a default value of 'en-CIS'. However, existing users should retain their existing preferences and not have the new 'LOCALE' column set to 'NULL'. Which of the following 'setup.sql' scripts correctly implements this requirement during the version upgrade?

Suggested Answer: C Vote an answer

Option C is the correct answer. Adding the column with DEFAULT 'en-US' and using the IF NOT EXISTS check will prevent errors when upgrading a second time (or if the column was manually added previously). Setting a default value at the column definition level automatically populates the new column for existing rows when the column is added. Option A will accomplish the immediate objective, but doesn't account for repeated runs of the script. Options B and E will not check the column existence and result in an error, as well as will populate all rows with 'en-US'. Option D is redundantly updating to 'en-US', but it has the same issue as Option B, as it doesn't check column existence and result in an error.

by Blithe at Jul 13, 2026, 06:42 AM

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