```
swh-web=> select loading_task_status, avg(visit_date - request_date) from save_origin_request where loading_task_status in ('succeeded', 'failed') group by loading_task_status;
 loading_task_status |       avg
---------------------+-----------------
 succeeded           | 06:13:01.904513
 failed              | 16:23:24.820058
(2 rows)

swh-web=> select loading_task_status, count(*) from save_origin_request where loading_task_status in ('succeeded', 'failed') group by loading_task_status;
 loading_task_status | count
---------------------+-------
 succeeded           | 66899
 failed              |  2231
(2 rows)

swh-web=> select loading_task_status, count(*) from save_origin_request where loading_task_status in ('succeeded', 'failed') and request_date >= '2021-01-01' group by loading_task_status;
 loading_task_status | count
---------------------+-------
 succeeded           | 15318
 failed              |   181
(2 rows)

swh-web=> select loading_task_status, avg(visit_data - request_date) from save_origin_request where loading_task_status in ('succeeded', 'failed') and request_date >= '2021-01-01' group by loading_task_status;
ERROR:  column "visit_data" does not exist
LINE 1: select loading_task_status, avg(visit_data - request_date) f...
                                        ^
HINT:  Perhaps you meant to reference the column "save_origin_request.visit_date".
swh-web=> select loading_task_status, avg(visit_date - request_date) from save_origin_request where loading_task_status in ('succeeded', 'failed') and request_date >= '2021-01-01' group by loading_task_status;
 loading_task_status |       avg
---------------------+-----------------
 succeeded           | 03:24:48.034856
 failed              | 07:09:21.202971
(2 rows)
```