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You are tasked with performing a descriptive analysis of website traffic data stored in a Snowflake table named 'website traffic'. The table includes columns such as 'session_id', 'user id', 'page_url' , 'timestamp' , and 'device_type'. Which of the following SQL queries would be MOST efficient and accurate for calculating the daily active users (DAU) and their device distribution?
Correct Answer: E
Option E is the most efficient and accurate. It correctly uses user_id)' to calculate DALI, groups by date and device type, and orders the results. Option A is missing aggregation to calculate DAU per device. Option B uses APPROX COUNT DISTINCT which is less accurate. Option C counts all user_id entries, not distinct users. Option D includes user_id in the GROUP BY, causing incorrect DAU calculation, and calculates total users incorrectly.