CREATE TABLE table_203_7 (id DECIMAL, "pos." DECIMAL, "artist" TEXT, "single" TEXT, "year" DECIMAL, "sales" DECIMAL, "peak" DECIMAL)

what were the total sales of eiffel 65 's blue -lrb- da ba dee -rrb- ?
SELECT "sales" FROM table_203_7 WHERE "single" = '"blue (da ba dee)"' AND "artist" = 'eiffel 65'
SELECT "sales" FROM "table_203_7" WHERE "artist" = 'eiffel 65' AND "single" = '"blue (da ba dee)"'