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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 (id, user_id, activity, log_time) 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,'start', '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');
with tasks as ( SELECT user_id, partition_condition ,TIMESTAMPDIFF(minute,min(log_time),max(log_time))time_diff FROM ( SELECT id, user_id, activity, log_time, row_number()over (Partition by user_id order by log_time)rn, sum(case when activity='start' then 1 else 0 end) over (partition by user_id order by log_time) as partition_condition FROM activities ) as tasks group by user_id, partition_condition ) select user_id,sum(time_diff)total_time from tasks group by user_id
user_id
total_time
1
60
2
20