CREATE TABLE genre (g_name CLOB, rating CLOB, most_popular_in CLOB)
CREATE TABLE artist (artist_name CLOB, country CLOB, gender CLOB, preferred_genre CLOB)
CREATE TABLE song (song_name CLOB, artist_name CLOB, country CLOB, f_id NUMBER, genre_is CLOB, rating NUMBER, languages CLOB, releasedate TIME, resolution NUMBER)
CREATE TABLE files (f_id NUMBER, artist_name CLOB, file_size CLOB, duration CLOB, formats CLOB)

Find the file format that is used by the most files.
SELECT formats FROM files GROUP BY formats ORDER BY COUNT(*) DESC LIMIT 1
SELECT "formats" FROM "files" GROUP BY "formats" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY