스파르타 코딩클럽 SQL (3)

(

select '7월' as month, c1.title, c2.week, count(*) as cnt from courses c1

inner join checkins c2 on c1.course_id = c2.course_id

inner join orders o on c2.user_id = o.user_id

where o.created_at >= '2020-08-01'

group by c1.title, c2.week

order by c1.title, c2.week

)

union all

(

select '8월' as month, c1.title, c2.week, count(*) as cnt from courses c1

inner join checkins c2 on c1.course_id = c2.course_id

inner join orders o on c2.user_id = o.user_id

where o.created_at >= '2020-08-01'

group by c1.title, c2.week

order by c1.title, c2.week

)

 

 

 

select e.enrolled_id, e.user_id, count(*) as cnt from enrolleds e

inner join enrolleds_detail ed on e.enrolled_id = ed.enrolled_id

where ed.done=1

group by e.enrolled_id, e.user_id

order by cnt DESC