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You are analyzing customer churn for a subscription-based service. You have a table 'SUBSCRIPTIONS' with columns: 'CUSTOMER_ID, 'START_DATE', 'END_DATE', 'SUBSCRIPTION TYPE, and 'REVENUE'. You want to classify customers who are likely to churn based on their past subscription behavior. Which Snowflake SQL code snippet is MOST efficient for calculating the number of months each customer was subscribed and identifying those who subscribed for less than 3 months as potential churn candidates?
Correct Answer: B
Option D is the most efficient. It calculates the 'MONTHS SUBSCRIBED directly in the SELECT statement and filters the results in the 'WHERE clause. Option A will produce an error because you cannot refer to an alias (MONTHS_SUBSCRIBED) in the same 'WHERE clause where it's defined. Option B creates a temporary table, which is unnecessary overhead for this simple calculation. Option C uses HAVING& which is used for filtering aggregated results, not individual rows before aggregation. Snowflake does not natively support MONTHS_BETWEEN, thus option E would result in an error.