Table: track_info
Columns: version
length
album
remixed_by
year

Question: What Version has a Remixed by Perky Park with a Length of 6:38?
SQL: SELECT "version" FROM track_info WHERE "remixed_by" = 'perky park' AND "length" = '6:38'

Question: What is the total number of Year that has an Album of Remixes?
SQL: SELECT SUM("year") FROM track_info WHERE "album" = 'remixes'

Question: What is listed for the Lengtht that has a Version of Single Version?
SQL: SELECT "length" FROM track_info WHERE "version" = 'single version'