Question: How many values of attendance occur when ave. on previous season is +645?
SQL: SELECT COUNT("Ave. Attendance") FROM "1-2970978-1" WHERE "+/- ave. on prev. season" = '+645';

Question: What is the lowest value of average attendance when average on previous season is -459?
SQL: SELECT MIN("Ave. Attendance") FROM "1-2970978-1" WHERE "+/- ave. on prev. season" = '-459';

Question: What is the least value for average attendance when average on previous season is +644?
SQL: SELECT MIN("Ave. Attendance") FROM "1-2970978-1" WHERE "+/- ave. on prev. season" = '+644';

Question: What is every value for average on previous season if the competition is League Two?
SQL: SELECT "+/- ave. on prev. season" FROM "1-2970978-1" WHERE "Competition" = 'League Two';