SELECT f_id FROM files WHERE formats  =  "mp4" UNION SELECT f_id FROM song WHERE resolution  >  720
What are the ids of all songs that are available on mp4 or have a higher resolution than 720?
SELECT f_id FROM files WHERE formats = `` mp4 '' UNION SELECT f_id FROM song WHERE resolution > 720
select f_id from files where formats = value union select f_id from song where resolution > value
What are the ids of all songs that are available on mp4 or have a higher resolution than 720 ?