CREATE TABLE table_56909 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When melbourne was the away team, what was the lowest crowd turnout they had?
SELECT MIN("Crowd") FROM table_56909 WHERE "Away team" = 'melbourne'
SELECT MIN("Crowd") FROM "table_56909" WHERE "Away team" = 'melbourne'