Въз основа на моето разбиране, ето заявката, която измислям:
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
Разбивката на заявката:
#1. Вземете идентификатора на члена със свързаните с него цели (innerQuery)
SELECT m.id memberId, COUNT(*) goalsCount
FROM Members m
JOIN Goals g
ON m.id = g.member_id
GROUP BY member_id
#2. Вземете идентификатора на отбора с общата СУМ на целите (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. Вземете общия брой членове на отбор (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. НАДЯСНО ПРИСЪЕДИНЕТЕ inner_1 и inner_2 (тъй като ще има NULL) и използвайте IFNULL, за да проверите и замените това 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