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CREATE TABLE t ( `id` INTEGER, `created` DATETIME, `deleted` DATETIME ); INSERT INTO t (`id`, `created`, `deleted`) VALUES ('01', '2022-05-01', '2022-08-01'), ('02', '2022-06-01', '2022-08-13'), ('03', '2022-07-01', null);
select dt ,sum(sum(delta)) over(order by dt) as active_user_count from ( select id, created as dt, 1 as delta from t union all select id, deleted, -1 from t where deleted is not null ) t group by dt
dt
active_user_count
2022-05-01 00:00:00
1
2022-06-01 00:00:00
2
2022-07-01 00:00:00
3
2022-08-01 00:00:00
2
2022-08-13 00:00:00
1