Which of these queries will only include purchase records from the underlying table?

Question

Accepted Answer

SELECT campaign, COUNT (DISTINCT user_id) AS purchasers, SUM (purchases) AS purchases FROM amazon_attributed_events_by_traffic_time WHERE purchases = 1 GROUP BY 1

Answer

SELECT campaign, COUNT (DISTINCT user_id) AS purchasers, SUM (purchases) AS purchases FROM amazon_attributed_events_by_traffic_time GROUP BY 1

Answer

SELECT campaign, COUNT (DISTINCT user_id) AS purchasers, SUM (purchases) AS purchases FROM conversions GROUP BY 1