(worker_id, event_date) is the PRIMARY KEY.

based on the table above, Write an SQL query that reports for each worker and date, how many tasks finished so far by the worker. That is, the total number of tasks finished by the worker until that date.

answer should look like this:

worker_id | computer_id | event_date | tasks 1 | 11 21 31 31 1 | 2 | 2019-03-01 | 2 | 2019-05-02 3 2020-06-25 1 | 2019-03-02 | 4 | 2020-07-03 | 3 2020-08-02 5 3 1 0 2 4 worker_id | event_date | tasks_finished_so_far 1 | 2019-03-01 | 1 | 2019-05-02 | 1 | 2020-08-02 | 2 | 2020-06-25 | 3 | 2019-03-02 3 | 2020-07-03 | 5 8 12 1 0 N