user: Question: How many heavy attacks did the 450 Luftflotte 2 conduct?
Columns: ['Month/Year', 'Day Sorties (losses)', 'Night Sorties (Losses)', 'Luftflotte 2 sorties', 'Luftflotte 3 sorties', 'Major attacks', 'Heavy attacks']
Types: ['text', 'text', 'text', 'real', 'real', 'text', 'real']
Sample row: ['October 1940', '2,300 (79)', '5,900 (23)', 2400.0, 3500.0, '25', 4.0]
SQL:

assistant: SELECT SUM("Heavy attacks") FROM "Table" WHERE "Luftflotte 2 sorties" = 450.0;