Leetcode - 1107. New Users Daily Count

Indo Yoon -

문제

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Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.
LeetCode

정답

SELECT login_date, COUNT(user_id) as user_count
FROM (
    SELECT user_id, MIN(activity_date) as login_date FROM Traffic
    WHERE activity = 'login'
    GROUP BY user_id
) as Temp
WHERE login_date >= date_add('2019-06-30', interval -90 day)
GROUP BY login_date