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Refactor SQL query for user activity report #12

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Refactor SQL query for user activity report #12

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16 changes: 12 additions & 4 deletions 1141-user-activity-for-the-past-30-days-i.sql
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Original file line number Diff line number Diff line change
@@ -1,5 +1,13 @@
# Write your MySQL query statement below
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;
SELECT
activity_date AS day,
COUNT(DISTINCT user_id) AS active_users
FROM
Activity
WHERE
DATEDIFF('2019-07-27', activity_date) < 30
AND activity_date <= '2019-07-27'
GROUP BY
activity_date
ORDER BY
day;