题解 | 网易云音乐推荐(网易校招笔试真题)
SELECT DISTINCT music_name
FROM (SELECT DISTINCT f.user_id, follower_id, music_id
FROM follow f
LEFT JOIN music_likes ml ON follower_id = ml.user_id
WHERE f.user_id = 1
ORDER BY music_id
) a
INNER JOIN music ON a.music_id = music.id
WHERE music_id NOT IN (SELECT music_id
FROM music_likes
WHERE user_id = 1);
注：理清f表中的关注关系。
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