query: SELECT song_name FROM singer WHERE age  >  (SELECT avg(age) FROM singer)
question: What-all are all the song names by singers which are older than average?
query_toks: SELECT song_name FROM singer WHERE age > ( SELECT avg ( age ) FROM singer )
query_toks_no_value: select song_name from singer where age > ( select avg ( age ) from singer )
question_toks: What-all are all the song names by singers which are older than average?