CREATE TABLE table_56762 ("Month/Year" TEXT, "Day Sorties  ( losses ) " TEXT, "Night Sorties  ( Losses ) " TEXT, "Luftflotte 2 sorties" FLOAT, "Luftflotte 3 sorties" FLOAT, "Major attacks" TEXT, "Heavy attacks" FLOAT)

How many heavy attacks did the 450 Luftflotte 2 conduct?
SELECT COUNT("Heavy attacks") FROM table_56762 WHERE "Luftflotte 2 sorties" = '450'
SELECT COUNT("Heavy attacks") FROM "table_56762" WHERE "Luftflotte 2 sorties" = '450'