• True
• False

The correct answer is: True

Explanation: True. In AMC, user_id values cannot be viewed in the UI or downloaded from AMC. The user_id column is classified with a “very high” aggregation threshold, meaning it can only be used for internal calculations (such as counting unique users or for grouping), but you can never expose or export actual user_id values in report output or downloads. This restriction is enforced for privacy and data protection.

Reference content: From Amazon’s official documentation – Data aggregation thresholds in AMC

“In practice, an aggregation threshold level of ‘very high’ means that you will never be able to select the column in the final SELECT statement of a SQL query because this statement would expose the values of the column in the final output. In this example the selecting the actual user_id in the final SELECT statement would expose a single user’s data, thus violating our privacy safeguards.”