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Leecode - 1141.User Activity for the Past 30 Days I

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    Name
    Indo Yoon
    Twitter
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문제

정답

SELECT activity_date as day, COUNT(DISTINCT user_id) as active_users
FROM Activity
# BETWEEN is inclusive so subtract 29 days
WHERE activity_date BETWEEN DATE_SUB('2019-07-27', INTERVAL 29 DAY) AND '2019-07-27'
GROUP BY activity_date