CREATE TABLE artist (artist_name CLOB, country CLOB, gender CLOB, preferred_genre CLOB)
CREATE TABLE genre (g_name CLOB, rating CLOB, most_popular_in CLOB)
CREATE TABLE files (f_id NUMBER, artist_name CLOB, file_size CLOB, duration CLOB, formats 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)

Find the id of the song that lasts the longest.
SELECT f_id FROM files ORDER BY duration DESC LIMIT 1
SELECT "f_id" FROM "files" ORDER BY "duration" DESC FETCH FIRST 1 ROWS ONLY