Comment puis-je joindre deux tables pour obtenir des statistiques

Question

j'ai une base de données MySQL avec deux tables en elle:

Members 
- id, name, city_id 

et:

Cities 
- id, name 

Je veux une requête qui renverra chaque nom de la ville et combien de membres y sont.

La sortie I besoin est:

city_name count 
------------------ 
New York  15 
Los Angeles 20 

Answer 1

quelque chose comme ceci:

SELECT a.name, COUNT(DISTINCT b.city_id) 
FROM Cities a JOIN Members b 
ON b.city_id = a.id 
GROUP BY b.city_id 

Answer 2

SELECT 
     c.name AS city_name, 
     COUNT(m.id) AS counter 
    FROM Members m 
    JOIN Cities c ON m.city_id = c.id 

Answer 3

select 
    cities.name as city_name, 
    count(cities.id) as counter 
from 
    members inner join cities 
on 
    members.city_id = cities.city.id 

Answer 4

Essayez cette

SELECT c.name city_name, COUNT(m.id) counter 
FROM Cities c INNER JOIN Members m 
ON c.id = m.city_id 
GROUP BY c.name 

Answer 5

Essayez s Quelque chose comme ceci:

select city.name, count(member.id) 
from city 
inner join members 
on city.id = members.city_id 
group by city.name 

Espérons que cela aide.