CREATE TABLE table_40748 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT, "Attendance" FLOAT)

What was the Attendance when Oxford United was the Home team?
SELECT SUM("Attendance") FROM table_40748 WHERE "Home team" = 'oxford united'
SELECT SUM("Attendance") FROM "table_40748" WHERE "Home team" = 'oxford united'