题解 | #网易云音乐推荐(网易校招笔试真题)#

因为只用一个查询时同时使用distinct和order by会报错，所以再套一层子查询

select music_name from
(select distinct ml.music_id,m.music_name
from follow f
left join music_likes ml on f.follower_id=ml.user_id
left join music m on ml.music_id=m.id
where f.user_id=1
and ml.music_id not in 
(
select music_id from music_likes where music_likes.user_id=1
)
)a
order by music_id