počet kurzů - Quarry

This query is marked as a draft This query has been published by Hubaceksarka.

SQL

use cswiki_p;
select course_name, count(user_id)
from
ep_users_per_course
join user on user_id=upc_user_id
join ep_courses on upc_course_id=course_id
join ep_orgs on course_org_id=org_id
where upc_role=0
group by user_id
order by course_name asc
;

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SQL

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