MySQL Gabung dan dapatkan semua relasi meskipun 0

agar join kiri berlaku, Anda perlu memindahkan kondisi earned_trophys.user_id = 1 ke dalam on klausa alih-alih where .

select
    trophy.name,
    earned_trophys.user_id,  
    count(user_id) as temp
from
    trophy
left join
    earned_trophys
on
    trophy.trophy_id = earned_trophys.trophy_id and earned_trophys.user_id = 1
group by
    name