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CREATE TABLE activities ( id INT NOT NULL, user_id INT NULL, activity VARCHAR(45), log_time DATETIME NOT NULL DEFAULT NOW(), PRIMARY KEY(id) ) ENGINE = InnoDB; INSERT INTO activities VALUES(6,1,'start', '2021-10-12 10:00:00'), (2,1,'task' , '2021-10-12 10:10:00'), (7,1,'task' , '2021-10-12 10:40:00'), (3,1,'start', '2021-10-12 16:00:00'), (1,1,'task', '2021-10-12 16:10:00'), (9,1,'task', '2021-10-14 08:00:00'), (10,1,'start','2021-10-16 09:00:00'), (4,1,'task', '2021-10-16 09:10:00'), (8,2,'start', '2021-10-12 10:00:00'), (5,2,'task', '2021-10-12 10:20:00');
SELECT user_id, SUM( TIMESTAMPDIFF(MINUTE, COALESCE( lg, log_time ), log_time ) ) AS total_time FROM (SELECT LAG(log_time) OVER (PARTITION BY user_id, DATE(log_time) ORDER BY log_time) AS lg, a.* FROM activities AS a ORDER BY log_time) AS aa WHERE activity != 'start' GROUP BY user_id ORDER BY 1
user_id
total_time
1
60
2
20