JPQL의 최적화를 위한 기능
페치 조인 :: = [LEFT [OUTER] | INNER ] JOIN FETCH 조인경로
엔티티 페치 조인
select m
from Member m join fetch m.team
→
SELECT
M.*, T.*
FROM MEMBER M
INNER JOIN TEAM T ON M.TEAM_ID=T.ID
select t
from Team t join fetch t.members
where t.name = '팀A'
→
SELECT
T.*, M.*
FROM TEAM T
INNER JOIN MEMBER M ON T.ID=M.TEAM_ID
WHERE T.NAME = '팀A'