D'après ce que j'ai compris, voici la requête que j'ai trouvée :
SELECT name, membersCount, IFNULL(totalCount, 0) goalsCount FROM
(
SELECT m.team_id, SUM(innerQuery.goalsCount) totalCount
FROM (
SELECT m.id memberId, COUNT(*) goalsCount
FROM Members m
JOIN Goals g
ON m.id = g.member_id
GROUP BY member_id
) innerQuery
JOIN Members m
ON innerQuery.memberId = m.id
GROUP BY m.team_id
) inner_1
RIGHT JOIN
(
SELECT t.id, t.name, COUNT(*) membersCount
FROM Teams t
JOIN Members m
ON t.id = m.team_id
GROUP BY team_id
) inner_2
ON inner_1.team_id = inner_2.id
La répartition de la requête :
#1. Obtenir l'identifiant du membre avec son nombre d'objectifs associés (innerQuery)
SELECT m.id memberId, COUNT(*) goalsCount
FROM Members m
JOIN Goals g
ON m.id = g.member_id
GROUP BY member_id
#2. Obtenez l'identifiant de l'équipe avec la somme totale des objectifs (inner_1)
SELECT m.team_id, SUM(innerQuery.goalsCount) totalCount
FROM (
.... Sub-query in step 1
) innerQuery
JOIN Members m
ON innerQuery.memberId = m.id
GROUP BY m.team_id
#3. Obtenir le nombre total de membres par équipe (inner_2)
SELECT t.id, t.name, COUNT(*) membersCount
FROM Teams t
JOIN Members m
ON t.id = m.team_id
GROUP BY team_id
#4. RIGHT JOIN inner_1 et inner_2 (car il y aura NULL) et utiliser IFNULL pour vérifier et remplacer ce 0
SELECT name, membersCount, IFNULL(totalCount, 0) goalsCount FROM
(
.... Sub-query in step 2
) inner_1
RIGHT JOIN
(
.... Sub-query in step 3
) inner_2
ON inner_1.team_id = inner_2.id