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USE leetcode;
# Table: Activity
CREATE TABLE IF NOT EXISTS Activity
(
user_id INT,
session_id INT,
activity_date DATE,
activity_type ENUM ('open_session', 'end_session', 'scroll_down', 'send_message')
);
TRUNCATE TABLE Activity;
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('1', '1', '2019-07-20', 'open_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('1', '1', '2019-07-20', 'scroll_down');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('1', '1', '2019-07-20', 'end_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('2', '4', '2019-07-20', 'open_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('2', '4', '2019-07-21', 'send_message');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('2', '4', '2019-07-21', 'end_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('3', '2', '2019-07-21', 'open_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('3', '2', '2019-07-21', 'send_message');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('3', '2', '2019-07-21', 'end_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('4', '3', '2019-06-25', 'open_session');
INSERT INTO Activity (user_id, session_id, activity_date, activity_type)
VALUES ('4', '3', '2019-06-25', 'end_session');
# Solution
SELECT activity_date day, COUNT(DISTINCT user_id) active_users
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30
AND DATEDIFF('2019-07-27', activity_date) >= 0
GROUP BY day;