более одного счета * sql в одном sql

Question

Я хочу использовать этот оператор sql как единый оператор, который приведет к 4 столбцам с разным счетом и company_id.

select company_id,count(*) as det from feedbacks a join(select id,company_id from users ) b on a.user_id = b.id where healthi_rating < 7 group by company_id 
select company_id,count(*) as neu from feedbacks a join(select id,company_id from users ) b on a.user_id = b.id where healthi_rating <9 && healthi_rating >=7 group by company_id 
select company_id,count(*) as pro from feedbacks a join(select id,company_id from users ) b on a.user_id = b.id where healthi_rating >=9 group by company_id 

может кто-то дать мне знать, как это сделать.

Answer 1

Для MySQL сделать

select company_id, 
     sum(healthi_rating < 7) as det, 
     sum(healthi_rating between 7 and 8) as neu, 
     sum(healthi_rating >= 9) as pro 
from feedbacks a 
join(select id, company_id from users) b on a.user_id = b.id 
group by company_id 

и использованием ANSI SQL Standard и без подзапроса users

select b.company_id, 
     sum(case when healthi_rating < 7 then 1 else 0 end) as det, 
     sum(case when healthi_rating between 7 and 8 then 1 else 0 end) as neu, 
     sum(case when healthi_rating >=9 then 1 else 0 end) as pro 
from feedbacks a 
join users b on a.user_id = b.id 
group by b.company_id