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4 years ago
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SELECT videos.id FROM videos WHERE videos.id IN(SELECT links.video_id FROM links WHERE links.playlist_id IN( SELECT mp.playlist_id FROM material_playlists mp WHERE mp.material_id IN( SELECT materials.id FROM materials INNER JOIN courses ON courses.id = materials.course_id INNER JOIN chapters ON chapters.id = materials.chapter_id WHERE courses.id = 39 ) ))
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