思路1
注意count要去重
SELECT activity_date AS day, COUNT(DISTINCT user_id) AS active_users
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30
GROUP BY activity_date;
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注意count要去重
SELECT activity_date AS day, COUNT(DISTINCT user_id) AS active_users
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30
GROUP BY activity_date;
Last updated
Was this helpful?