Database: music_1
Question: What are the names of all songs that are in mp3 format and have a resolution lower than 1000?
SQL:
SELECT T2.song_name FROM files AS T1 JOIN song AS T2 ON T1.f_id  =  T2.f_id WHERE T1.formats  =  "mp3" INTERSECT SELECT song_name FROM song WHERE resolution  <  1000